Ontario, Canada

Planting calendar for Sarnia

Last frost around April 16, first frost around November 14: about 212 frost-free days.

Last frost: April 16
First frost: November 14
Frost-free days: 212

Sow now: November

See the whole year

Outdoors

Garlic
Raspberry
Rhubarb

Under cover

Nothing this month.

The year at a glance

When each crop can be sown in Sarnia. Tap a crop for exact dates and when it’s ready to harvest.

Sow outdoorsSow under cover (indoors, a greenhouse or a cold frame)

When to sow each crop in Sarnia, month by month. Each month says whether you can sow outdoors, under cover, or both.
Crop	JJan	FFeb	MMar	AApr	MMay	JJun	JJul	AAug	SSep	OOct	NNov	DDec
Fruiting
Tomato	January: Not this month	February: Not this month	March: Not this month	April: Sow under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow under cover	August: Not this month	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Chile pepper	January: Not this month	February: Not this month	March: Not this month	April: Sow under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow under cover	August: Not this month	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Bell pepper	January: Not this month	February: Not this month	March: Not this month	April: Not this month	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow under cover	August: Not this month	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Eggplant	January: Not this month	February: Not this month	March: Not this month	April: Not this month	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow under cover	August: Not this month	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Zucchini	January: Not this month	February: Not this month	March: Not this month	April: Sow under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Cucumber	January: Not this month	February: Not this month	March: Not this month	April: Sow under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Winter squash	January: Not this month	February: Not this month	March: Not this month	April: Sow under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow under cover	August: Sow under cover	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Sweet corn	January: Not this month	February: Not this month	March: Not this month	April: Sow under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow under cover	August: Sow under cover	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Roots
Carrot	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Sow under cover	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Beet	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Parsnip	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow under cover	August: Not this month	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Radish	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Sow outdoors and under cover	September: Sow outdoors and under cover	October: Sow under cover	November: Not this month	December: Not this month
Potato	January: Not this month	February: Not this month	March: Plant under cover	April: Plant outdoors and under cover	May: Plant outdoors and under cover	June: Plant outdoors and under cover	July: Plant under cover	August: Plant under cover	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Turnip	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Leaves
Lettuce	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Spinach	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow outdoors and under cover	October: Sow under cover	November: Not this month	December: Not this month
Swiss chard	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Arugula	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow outdoors and under cover	October: Sow under cover	November: Not this month	December: Not this month
Celery	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Not this month	August: Not this month	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Beans and peas
Runner bean	January: Not this month	February: Not this month	March: Not this month	April: Sow under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Green bean	January: Not this month	February: Not this month	March: Not this month	April: Sow under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Fava bean	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow under cover	June: Not this month	July: Not this month	August: Not this month	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Pea	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Sow outdoors and under cover	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Onion family
Onion	January: Not this month	February: Not this month	March: Plant under cover	April: Plant outdoors and under cover	May: Plant outdoors and under cover	June: Plant under cover	July: Not this month	August: Not this month	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Garlic	January: Not this month	February: Not this month	March: Not this month	April: Not this month	May: Not this month	June: Not this month	July: Not this month	August: Not this month	September: Plant under cover	October: Plant outdoors and under cover	November: Plant outdoors and under cover	December: Plant under cover
Leek	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Sow under cover	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Scallion	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Sow outdoors and under cover	September: Sow outdoors and under cover	October: Not this month	November: Not this month	December: Not this month
Shallot	January: Not this month	February: Not this month	March: Plant under cover	April: Plant outdoors and under cover	May: Plant outdoors and under cover	June: Plant outdoors and under cover	July: Plant under cover	August: Not this month	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Brassicas
Cabbage	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Broccoli	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Sow under cover	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Cauliflower	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow under cover	August: Not this month	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Brussels sprout	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow under cover	August: Not this month	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Kale	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Bok choy	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow outdoors and under cover	October: Sow under cover	November: Not this month	December: Not this month
Herbs
Basil	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Parsley	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Cilantro	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow outdoors and under cover	October: Sow under cover	November: Not this month	December: Not this month
Chives	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow under cover	August: Sow outdoors and under cover	September: Sow under cover	October: Not this month	November: Not this month	December: Not this month
Mint	January: Not this month	February: Not this month	March: Sow under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow outdoors and under cover	July: Sow outdoors and under cover	August: Sow outdoors and under cover	September: Sow outdoors and under cover	October: Sow under cover	November: Not this month	December: Not this month
Fruit
Strawberry	January: Not this month	February: Not this month	March: Plant under cover	April: Plant outdoors and under cover	May: Plant outdoors and under cover	June: Plant outdoors and under cover	July: Plant under cover	August: Plant outdoors and under cover	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Raspberry	January: Not this month	February: Not this month	March: Not this month	April: Not this month	May: Not this month	June: Not this month	July: Not this month	August: Not this month	September: Not this month	October: Plant under cover	November: Plant outdoors and under cover	December: Plant under cover
Rhubarb	January: Not this month	February: Not this month	March: Not this month	April: Not this month	May: Not this month	June: Not this month	July: Not this month	August: Not this month	September: Not this month	October: Plant outdoors and under cover	November: Plant outdoors and under cover	December: Plant under cover

Fruit rows show when to plant, not sow.

Crop by crop

Fruiting

TomatoOutdoors May 21 to Jun 15; Under cover Apr 23 to Jul 13

Sow outdoors: May 21 to Jun 15
Under cover: Apr 23 to Jul 13
First harvest: About 66 days after sowing. Sown on May 21, ready around July 26.
Warmth: Tender: needs days averaging 12°C or more, and no frost.

Tomato across Canada, town by town

Chile pepperOutdoors May 20 to Jun 15; Under cover Apr 22 to Jul 13

Sow outdoors: May 20 to Jun 15
Under cover: Apr 22 to Jul 13
First harvest: About 84 days after sowing. Sown on May 20, ready around August 12.
Warmth: Tender: needs days averaging 12°C or more, and no frost.

Chile pepper across Canada, town by town

Bell pepperOutdoors May 25 to Jun 20; Under cover Apr 27 to Jul 18

Sow outdoors: May 25 to Jun 20
Under cover: Apr 27 to Jul 18
First harvest: About 78 days after sowing. Sown on May 25, ready around August 11.
Warmth: Tender: needs days averaging 12°C or more, and no frost.

Bell pepper across Canada, town by town

EggplantOutdoors May 25 to Jun 15; Under cover Apr 27 to Jul 13

Sow outdoors: May 25 to Jun 15
Under cover: Apr 27 to Jul 13
First harvest: About 90 days after sowing. Sown on May 25, ready around August 23.
Warmth: Tender: needs days averaging 12°C or more, and no frost.

Eggplant across Canada, town by town

ZucchiniOutdoors May 20 to Jun 30, and Jul 27 to Aug 21; Under cover Apr 22 to Sep 18

Sow outdoors: May 20 to Jun 30, and Jul 27 to Aug 21
Under cover: Apr 22 to Sep 18
First harvest: About 44 days after sowing. Sown on May 20, ready around July 3.
Warmth: Tender: needs days averaging 12°C or more, and no frost.

Zucchini across Canada, town by town

CucumberOutdoors May 20 to Jun 30, and Jul 27 to Aug 16; Under cover Apr 22 to Sep 13

Sow outdoors: May 20 to Jun 30, and Jul 27 to Aug 16
Under cover: Apr 22 to Sep 13
First harvest: About 49 days after sowing. Sown on May 20, ready around July 8.
Warmth: Tender: needs days averaging 12°C or more, and no frost.

Cucumber across Canada, town by town

Winter squashOutdoors May 20 to Jun 20, and Jul 27 to Aug 2; Under cover Apr 22 to Jul 18, and Jul 27 to Aug 2, and Aug 24 to Aug 30

Sow outdoors: May 20 to Jun 20, and Jul 27 to Aug 2
Under cover: Apr 22 to Jul 18, and Jul 27 to Aug 2, and Aug 24 to Aug 30
First harvest: About 66 days after sowing. Sown on May 20, ready around July 25.
Warmth: Tender: needs days averaging 12°C or more, and no frost.

Winter squash across Canada, town by town

Sweet cornOutdoors May 15 to Jun 20, and Jul 27 to Aug 4; Under cover Apr 17 to Jul 18, and Jul 27 to Aug 4, and Aug 24 to Sep 1

Sow outdoors: May 15 to Jun 20, and Jul 27 to Aug 4
Under cover: Apr 17 to Jul 18, and Jul 27 to Aug 4, and Aug 24 to Sep 1
First harvest: About 63 days after sowing. Sown on May 15, ready around July 17.
Warmth: Tender: needs days averaging 11°C or more, and no frost.

Sweet corn across Canada, town by town

Roots

CarrotOutdoors Apr 17 to Aug 3; Under cover Mar 20 to Aug 31

Sow outdoors: Apr 17 to Aug 3
Under cover: Mar 20 to Aug 31
First harvest: About 71 days after sowing. Sown on April 17, ready around June 27.
Warmth: Hardy: grows once days average 7°C.

Carrot across Canada, town by town

BeetOutdoors Apr 17 to Aug 18; Under cover Mar 20 to Sep 15

Sow outdoors: Apr 17 to Aug 18
Under cover: Mar 20 to Sep 15
First harvest: About 50 days after sowing. Sown on April 17, ready around June 6.
Warmth: Hardy: grows once days average 7°C.

Beet across Canada, town by town

ParsnipOutdoors Apr 12 to Jun 28; Under cover Mar 15 to Jul 26

Sow outdoors: Apr 12 to Jun 28
Under cover: Mar 15 to Jul 26
First harvest: About 86 days after sowing. Sown on April 12, ready around July 7.
Warmth: Hardy: grows once days average 6°C.

Parsnip across Canada, town by town

RadishOutdoors Apr 12 to Jun 18, and Jul 11 to Sep 26; Under cover Mar 15 to Oct 24

Sow outdoors: Apr 12 to Jun 18, and Jul 11 to Sep 26
Under cover: Mar 15 to Oct 24
First harvest: About 19 days after sowing. Sown on April 12, ready around May 1.
Warmth: Hardy: grows once days average 6°C; bolts in hot weather.

Radish across Canada, town by town

PotatoOutdoors Apr 12 to Jun 7, and Jul 27 to Aug 3; Under cover Mar 15 to Jul 6, and Jul 27 to Aug 3, and Aug 24 to Aug 31

Plant outdoors: Apr 12 to Jun 7, and Jul 27 to Aug 3
Under cover: Mar 15 to Jul 6, and Jul 27 to Aug 3, and Aug 24 to Aug 31
First harvest: About 65 days after planting. Planted on April 12, ready around June 16.
Warmth: Hardy: grows once days average 6°C.

Potato across Canada, town by town

TurnipOutdoors Apr 12 to Aug 30; Under cover Mar 15 to Sep 27

Sow outdoors: Apr 12 to Aug 30
Under cover: Mar 15 to Sep 27
First harvest: About 38 days after sowing. Sown on April 12, ready around May 20.
Warmth: Hardy: grows once days average 6°C.

Turnip across Canada, town by town

Leaves

LettuceOutdoors Apr 13 to Jun 3, and Jul 26 to Aug 25; Under cover Mar 16 to Sep 22

Sow outdoors: Apr 13 to Jun 3, and Jul 26 to Aug 25
Under cover: Mar 16 to Sep 22
First harvest: About 46 days after sowing. Sown on April 13, ready around May 29.
Warmth: Hardy: grows once days average 6°C; bolts in hot weather.

Lettuce across Canada, town by town

SpinachOutdoors Apr 12 to Jun 3, and Jul 26 to Sep 21; Under cover Mar 15 to Oct 19

Sow outdoors: Apr 12 to Jun 3, and Jul 26 to Sep 21
Under cover: Mar 15 to Oct 19
First harvest: About 29 days after sowing. Sown on April 12, ready around May 11.
Warmth: Hardy: grows once days average 6°C; bolts in hot weather.

Spinach across Canada, town by town

Swiss chardOutdoors Apr 17 to Aug 30; Under cover Mar 20 to Sep 27

Sow outdoors: Apr 17 to Aug 30
Under cover: Mar 20 to Sep 27
First harvest: About 43 days after sowing. Sown on April 17, ready around May 30.
Warmth: Hardy: grows once days average 7°C.

Swiss chard across Canada, town by town

ArugulaOutdoors Apr 12 to Jun 3, and Jul 26 to Sep 22; Under cover Mar 15 to Oct 20

Sow outdoors: Apr 12 to Jun 3, and Jul 26 to Sep 22
Under cover: Mar 15 to Oct 20
First harvest: About 26 days after sowing. Sown on April 12, ready around May 8.
Warmth: Hardy: grows once days average 6°C; bolts in hot weather.

Arugula across Canada, town by town

CeleryOutdoors Apr 9 to Jun 8; Under cover Mar 12 to Jul 6

Sow outdoors: Apr 9 to Jun 8
Under cover: Mar 12 to Jul 6
First harvest: About 81 days after sowing. Sown on April 9, ready around June 29.
Warmth: Hardy: grows once days average 5°C.

Celery across Canada, town by town

Beans and peas

Runner beanOutdoors May 15 to Jun 30, and Jul 27 to Aug 8; Under cover Apr 17 to Aug 8, and Aug 24 to Sep 5

Sow outdoors: May 15 to Jun 30, and Jul 27 to Aug 8
Under cover: Apr 17 to Aug 8, and Aug 24 to Sep 5
First harvest: About 60 days after sowing. Sown on May 15, ready around July 14.
Warmth: Tender: needs days averaging 11°C or more, and no frost.

Runner bean across Canada, town by town

Green beanOutdoors May 15 to Aug 18; Under cover Apr 17 to Sep 15

Sow outdoors: May 15 to Aug 18
Under cover: Apr 17 to Sep 15
First harvest: About 50 days after sowing. Sown on May 15, ready around July 4.
Warmth: Tender: needs days averaging 11°C or more, and no frost.

Green bean across Canada, town by town

Fava beanOutdoors Apr 6 to Apr 21; Under cover Mar 9 to Mar 24, and Apr 6 to Apr 21, and May 4 to May 19

Sow outdoors: Apr 6 to Apr 21
Under cover: Mar 9 to Mar 24, and Apr 6 to Apr 21, and May 4 to May 19
First harvest: About 220 days after sowing. Sown on April 6, ready around November 12.
Warmth: Hardy: goes in as the weather cools, and grows on through winter.

Fava bean across Canada, town by town

PeaOutdoors Apr 12 to Jun 18, and Jul 11 to Aug 9; Under cover Mar 15 to Sep 6

Sow outdoors: Apr 12 to Jun 18, and Jul 11 to Aug 9
Under cover: Mar 15 to Sep 6
First harvest: About 52 days after sowing. Sown on April 12, ready around June 3.
Warmth: Hardy: grows once days average 6°C; bolts in hot weather.

Pea across Canada, town by town

Onion family

OnionOutdoors Apr 11 to Jun 1; Under cover Mar 14 to Jun 29

Plant outdoors: Apr 11 to Jun 1
Under cover: Mar 14 to Jun 29
First harvest: About 91 days after planting. Planted on April 11, ready around July 11.
Warmth: Hardy: grows once days average 6°C.

Onion across Canada, town by town

GarlicOutdoors Oct 15 to Nov 12; Under cover Sep 17 to Dec 10

Plant outdoors: Oct 15 to Nov 12
Under cover: Sep 17 to Dec 10
First harvest: About 250 days after planting. Planted on October 15, ready around June 22.
Warmth: Hardy: goes in as the weather cools, and grows on through winter.

Garlic across Canada, town by town

LeekOutdoors Apr 12 to Jul 28; Under cover Mar 15 to Aug 25

Sow outdoors: Apr 12 to Jul 28
Under cover: Mar 15 to Aug 25
First harvest: About 99 days after sowing. Sown on April 12, ready around July 20.
Warmth: Hardy: grows once days average 6°C.

Leek across Canada, town by town

ScallionOutdoors Apr 9 to Sep 8; Under cover Mar 12 to Oct 6

Sow outdoors: Apr 9 to Sep 8
Under cover: Mar 12 to Oct 6
First harvest: About 42 days after sowing. Sown on April 9, ready around May 21.
Warmth: Hardy: grows once days average 5°C.

Scallion across Canada, town by town

ShallotOutdoors Apr 6 to Jun 19; Under cover Mar 9 to Jul 17

Plant outdoors: Apr 6 to Jun 19
Under cover: Mar 9 to Jul 17
First harvest: About 78 days after planting. Planted on April 6, ready around June 23.
Warmth: Hardy: grows once days average 5°C.

Shallot across Canada, town by town

Brassicas

CabbageOutdoors Apr 12 to Aug 12; Under cover Mar 15 to Sep 9

Sow outdoors: Apr 12 to Aug 12
Under cover: Mar 15 to Sep 9
First harvest: About 72 days after sowing. Sown on April 12, ready around June 23.
Warmth: Hardy: grows once days average 6°C.

Cabbage across Canada, town by town

BroccoliOutdoors Apr 17 to Aug 4; Under cover Mar 20 to Sep 1

Sow outdoors: Apr 17 to Aug 4
Under cover: Mar 20 to Sep 1
First harvest: About 64 days after sowing. Sown on April 17, ready around June 20.
Warmth: Hardy: grows once days average 7°C.

Broccoli across Canada, town by town

CauliflowerOutdoors Apr 12 to Jun 18; Under cover Mar 15 to Jul 16

Sow outdoors: Apr 12 to Jun 18
Under cover: Mar 15 to Jul 16
First harvest: About 79 days after sowing. Sown on April 12, ready around June 30.
Warmth: Hardy: grows once days average 6°C; bolts in hot weather.

Cauliflower across Canada, town by town

Brussels sproutOutdoors Apr 12 to Jun 12; Under cover Mar 15 to Jul 10

Sow outdoors: Apr 12 to Jun 12
Under cover: Mar 15 to Jul 10
First harvest: About 117 days after sowing. Sown on April 12, ready around August 7.
Warmth: Hardy: grows once days average 6°C.

Brussels sprout across Canada, town by town

KaleOutdoors Apr 17 to Aug 12; Under cover Mar 20 to Sep 9

Sow outdoors: Apr 17 to Aug 12
Under cover: Mar 20 to Sep 9
First harvest: About 57 days after sowing. Sown on April 17, ready around June 13.
Warmth: Hardy: grows once days average 7°C.

Kale across Canada, town by town

Bok choyOutdoors Apr 22 to Jun 3, and Jul 26 to Sep 12; Under cover Mar 25 to Oct 10

Sow outdoors: Apr 22 to Jun 3, and Jul 26 to Sep 12
Under cover: Mar 25 to Oct 10
First harvest: About 35 days after sowing. Sown on April 22, ready around May 27.
Warmth: Hardy: grows once days average 8°C; bolts in hot weather.

Bok choy across Canada, town by town

Herbs

BasilOutdoors Apr 22 to Aug 22; Under cover Mar 25 to Sep 19

Sow outdoors: Apr 22 to Aug 22
Under cover: Mar 25 to Sep 19
First harvest: About 37 days after sowing. Sown on April 22, ready around May 29.
Warmth: Tender: needs days averaging 8°C or more, and no frost.

Basil across Canada, town by town

ParsleyOutdoors Apr 12 to Aug 28; Under cover Mar 15 to Sep 25

Sow outdoors: Apr 12 to Aug 28
Under cover: Mar 15 to Sep 25
First harvest: About 48 days after sowing. Sown on April 12, ready around May 30.
Warmth: Hardy: grows once days average 6°C.

Parsley across Canada, town by town

CilantroOutdoors Apr 17 to Jun 3, and Jul 26 to Sep 11; Under cover Mar 20 to Oct 9

Sow outdoors: Apr 17 to Jun 3, and Jul 26 to Sep 11
Under cover: Mar 20 to Oct 9
First harvest: About 36 days after sowing. Sown on April 17, ready around May 23.
Warmth: Hardy: grows once days average 7°C; bolts in hot weather.

Cilantro across Canada, town by town

ChivesOutdoors Apr 12 to Jun 28, and Jul 27 to Aug 12; Under cover Mar 15 to Aug 12, and Aug 24 to Sep 9

Sow outdoors: Apr 12 to Jun 28, and Jul 27 to Aug 12
Under cover: Mar 15 to Aug 12, and Aug 24 to Sep 9
First harvest: Crops every year once it’s established.
Warmth: Hardy: grows once days average 6°C.

Chives across Canada, town by town

MintOutdoors Apr 17 to Sep 30; Under cover Mar 20 to Oct 28

Sow outdoors: Apr 17 to Sep 30
Under cover: Mar 20 to Oct 28
First harvest: Crops every year once it’s established.
Warmth: Hardy: grows once days average 7°C.

Mint across Canada, town by town

Fruit

StrawberryOutdoors Apr 12 to Jun 12, and Jul 27 to Aug 9; Under cover Mar 15 to Jul 12, and Jul 27 to Aug 9, and Aug 24 to Sep 6

Plant outdoors: Apr 12 to Jun 12, and Jul 27 to Aug 9
Under cover: Mar 15 to Jul 12, and Jul 27 to Aug 9, and Aug 24 to Sep 6
First harvest: Crops every year once it’s established.
Warmth: Hardy: grows once days average 6°C.

Strawberry across Canada, town by town

RaspberryOutdoors Nov 1 to Nov 20; Under cover Oct 4 to Oct 23, and Nov 1 to Nov 20, and Nov 29 to Dec 18

Plant outdoors: Nov 1 to Nov 20
Under cover: Oct 4 to Oct 23, and Nov 1 to Nov 20, and Nov 29 to Dec 18
First harvest: Crops every year once it’s established.
Warmth: Hardy: goes in as the weather cools, and grows on through winter.

Raspberry across Canada, town by town

RhubarbOutdoors Oct 23 to Nov 17; Under cover Sep 25 to Dec 15

Plant outdoors: Oct 23 to Nov 17
Under cover: Sep 25 to Dec 15
First harvest: Crops every year once it’s established.
Warmth: Hardy: goes in as the weather cools, and grows on through winter.

Rhubarb across Canada, town by town

Nearby

Questions about growing in Sarnia

When is the last frost in Sarnia?

On average around April 16, and the first autumn frost comes around November 14. In a cold spring a frost can come a week or two late, so tender plants are safest out a week after the date.

Can I grow tomatoes outdoors in Sarnia?

Yes. Plant them outdoors May 21 to Jun 15, or under cover Apr 23 to Jul 13.

What can I sow in Sarnia in November?

Outdoors: garlic, raspberry, rhubarb.

How accurate are these dates?

They’re worked out from 30 years of climate data for this spot, adjusted for its height, so they’re a good guide for a typical year. Check the forecast before planting out anything tender.

Get these dates as reminders

Bia turns this calendar into a nudge when it’s time to sow, plant out and harvest, for your backyard or community garden plot in Sarnia. Free for 2 months.

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How these dates are worked out: climate records for this spot (ERA5-Land, 1995 to 2024), the local frost dates and the height above sea level turn a seed-packet date into a local one. Contains modified Copernicus Climate Change Service information; towns from GeoNames (CC BY 4.0). How sowing dates work