England, UK

Planting calendar for Hemel Hempstead

Last frost around 14 April, first frost around 12 November: about 212 frost-free days.

Last frost: 14 April
First frost: 12 November
Frost-free days: 212

Sow now: November

See the whole year

Outdoors

Broad bean
Garlic
Raspberry
Rhubarb

Under cover

Nothing this month.

The year at a glance

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

Sow outdoorsSow under cover (a greenhouse or polytunnel)

When to sow each crop in Hemel Hempstead, 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
Chilli	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
Sweet 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
Aubergine	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
Courgette	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
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: Not this month	September: Not this month	October: Not this month	November: Not this month	December: Not this month
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: Not this month	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Sweetcorn	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
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: Not this month	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Beetroot	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
Parsnip	January: Not this month	February: Sow under cover	March: Sow outdoors and under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow 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
Radish	January: Not this month	February: Sow under cover	March: Sow outdoors and 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: Plant under cover	March: Plant outdoors and under cover	April: Plant outdoors and under cover	May: Plant outdoors and 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
Turnip	January: Not this month	February: Sow under cover	March: Sow outdoors and 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: Sow under cover	March: Sow outdoors and 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
Spinach	January: Not this month	February: Sow under cover	March: Sow outdoors and 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
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
Rocket	January: Not this month	February: Sow under cover	March: Sow outdoors and 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
Celery	January: Not this month	February: Sow under cover	March: Sow outdoors and 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
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: Not this month	September: Not this month	October: Not this month	November: Not this month	December: Not this month
French 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 under cover	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Broad bean	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: Sow under cover	October: Sow outdoors and under cover	November: Sow outdoors and under cover	December: Sow under cover
Pea	January: Not this month	February: Sow under cover	March: Sow outdoors and 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
Onion family
Onion	January: Not this month	February: Plant under cover	March: Plant outdoors and under cover	April: Plant outdoors and under cover	May: Plant 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
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: Sow under cover	March: Sow outdoors and 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
Spring onion	January: Not this month	February: Sow under cover	March: Sow outdoors and 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
Shallot	January: Plant under cover	February: Plant outdoors and under cover	March: Plant outdoors and under cover	April: Plant outdoors and under cover	May: Plant 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
Brassicas
Cabbage	January: Not this month	February: Sow under cover	March: Sow outdoors and 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
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 under cover	August: Not this month	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Cauliflower	January: Not this month	February: Sow under cover	March: Sow outdoors and 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: Sow under cover	March: Sow outdoors and under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow 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
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 under cover	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Pak choi	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
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 under cover	September: Not this month	October: Not this month	November: Not this month	December: Not this month
Parsley	January: Not this month	February: Sow under cover	March: Sow outdoors and 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
Coriander	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
Chives	January: Not this month	February: Sow under cover	March: Sow outdoors and under cover	April: Sow outdoors and under cover	May: Sow outdoors and under cover	June: Sow 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
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: Plant under cover	March: Plant outdoors and 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
Raspberry	January: Plant under cover	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 outdoors and under cover
Rhubarb	January: Plant under cover	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 outdoors and under cover

Fruit rows show when to plant, not sow.

Crop by crop

Fruiting

TomatoOutdoors 19 May to 13 Jun; Under cover 21 Apr to 11 Jul

Sow outdoors: 19 May to 13 Jun
Under cover: 21 Apr to 11 Jul
First harvest: About 103 days after sowing. Sown on 19 May, ready around 30 August.
Warmth: Tender: needs days averaging 12°C or more, and no frost.

Tomato across the UK, town by town

ChilliOutdoors 18 May to 13 Jun; Under cover 20 Apr to 11 Jul

Sow outdoors: 18 May to 13 Jun
Under cover: 20 Apr to 11 Jul
First harvest: About 121 days after sowing. Sown on 18 May, ready around 16 September.
Warmth: Tender: needs days averaging 12°C or more, and no frost.

Chilli across the UK, town by town

Sweet pepperOutdoors 23 May to 18 Jun; Under cover 25 Apr to 16 Jul

Sow outdoors: 23 May to 18 Jun
Under cover: 25 Apr to 16 Jul
First harvest: About 114 days after sowing. Sown on 23 May, ready around 14 September.
Warmth: Tender: needs days averaging 12°C or more, and no frost.

Sweet pepper across the UK, town by town

AubergineOutdoors 23 May to 13 Jun; Under cover 25 Apr to 11 Jul

Sow outdoors: 23 May to 13 Jun
Under cover: 25 Apr to 11 Jul
First harvest: About 117 days after sowing. Sown on 23 May, ready around 17 September.
Warmth: Tender: needs days averaging 12°C or more, and no frost.

Aubergine across the UK, town by town

CourgetteOutdoors 18 May to 28 Jun; Under cover 20 Apr to 26 Jul

Sow outdoors: 18 May to 28 Jun
Under cover: 20 Apr to 26 Jul
First harvest: About 59 days after sowing. Sown on 18 May, ready around 16 July.
Warmth: Tender: needs days averaging 12°C or more, and no frost.

Courgette across the UK, town by town

CucumberOutdoors 18 May to 28 Jun; Under cover 20 Apr to 26 Jul

Sow outdoors: 18 May to 28 Jun
Under cover: 20 Apr to 26 Jul
First harvest: About 69 days after sowing. Sown on 18 May, ready around 26 July.
Warmth: Tender: needs days averaging 12°C or more, and no frost.

Cucumber across the UK, town by town

SquashOutdoors 18 May to 18 Jun; Under cover 20 Apr to 16 Jul

Sow outdoors: 18 May to 18 Jun
Under cover: 20 Apr to 16 Jul
First harvest: About 103 days after sowing. Sown on 18 May, ready around 29 August.
Warmth: Tender: needs days averaging 12°C or more, and no frost.

Squash across the UK, town by town

SweetcornOutdoors 13 May to 18 Jun; Under cover 15 Apr to 16 Jul

Sow outdoors: 13 May to 18 Jun
Under cover: 15 Apr to 16 Jul
First harvest: About 96 days after sowing. Sown on 13 May, ready around 17 August.
Warmth: Tender: needs days averaging 11°C or more, and no frost.

Sweetcorn across the UK, town by town

Roots

CarrotOutdoors 29 Mar to 7 Jul; Under cover 1 Mar to 4 Aug

Sow outdoors: 29 Mar to 7 Jul
Under cover: 1 Mar to 4 Aug
First harvest: About 100 days after sowing. Sown on 29 March, ready around 7 July.
Warmth: Hardy: grows once days average 7°C.

Carrot across the UK, town by town

BeetrootOutdoors 29 Mar to 12 Jul; Under cover 1 Mar to 9 Aug

Sow outdoors: 29 Mar to 12 Jul
Under cover: 1 Mar to 9 Aug
First harvest: About 70 days after sowing. Sown on 29 March, ready around 7 June.
Warmth: Hardy: grows once days average 7°C.

Beetroot across the UK, town by town

ParsnipOutdoors 13 Mar to 29 May; Under cover 13 Feb to 26 Jun

Sow outdoors: 13 Mar to 29 May
Under cover: 13 Feb to 26 Jun
First harvest: About 129 days after sowing. Sown on 13 March, ready around 20 July.
Warmth: Hardy: grows once days average 6°C.

Parsnip across the UK, town by town

RadishOutdoors 13 Mar to 18 Sep; Under cover 13 Feb to 16 Oct

Sow outdoors: 13 Mar to 18 Sep
Under cover: 13 Feb to 16 Oct
First harvest: About 29 days after sowing. Sown on 13 March, ready around 11 April.
Warmth: Hardy: grows once days average 6°C; bolts in hot weather.

Radish across the UK, town by town

PotatoOutdoors 13 Mar to 8 May; Under cover 13 Feb to 5 Jun

Plant outdoors: 13 Mar to 8 May
Under cover: 13 Feb to 5 Jun
First harvest: About 100 days after planting. Planted on 13 March, ready around 21 June.
Warmth: Hardy: grows once days average 6°C.

Potato across the UK, town by town

TurnipOutdoors 13 Mar to 19 Aug; Under cover 13 Feb to 16 Sep

Sow outdoors: 13 Mar to 19 Aug
Under cover: 13 Feb to 16 Sep
First harvest: About 61 days after sowing. Sown on 13 March, ready around 13 May.
Warmth: Hardy: grows once days average 6°C.

Turnip across the UK, town by town

Leaves

LettuceOutdoors 18 Mar to 14 Aug; Under cover 18 Feb to 11 Sep

Sow outdoors: 18 Mar to 14 Aug
Under cover: 18 Feb to 11 Sep
First harvest: About 70 days after sowing. Sown on 18 March, ready around 27 May.
Warmth: Hardy: grows once days average 6°C; bolts in hot weather.

Lettuce across the UK, town by town

SpinachOutdoors 13 Mar to 18 Sep; Under cover 13 Feb to 16 Oct

Sow outdoors: 13 Mar to 18 Sep
Under cover: 13 Feb to 16 Oct
First harvest: About 46 days after sowing. Sown on 13 March, ready around 28 April.
Warmth: Hardy: grows once days average 6°C; bolts in hot weather.

Spinach across the UK, town by town

Swiss chardOutdoors 29 Mar to 19 Aug; Under cover 1 Mar to 16 Sep

Sow outdoors: 29 Mar to 19 Aug
Under cover: 1 Mar to 16 Sep
First harvest: About 60 days after sowing. Sown on 29 March, ready around 28 May.
Warmth: Hardy: grows once days average 7°C.

Swiss chard across the UK, town by town

RocketOutdoors 13 Mar to 18 Sep; Under cover 13 Feb to 16 Oct

Sow outdoors: 13 Mar to 18 Sep
Under cover: 13 Feb to 16 Oct
First harvest: About 41 days after sowing. Sown on 13 March, ready around 23 April.
Warmth: Hardy: grows once days average 6°C; bolts in hot weather.

Rocket across the UK, town by town

CeleryOutdoors 27 Feb to 28 Apr; Under cover 30 Jan to 26 May

Sow outdoors: 27 Feb to 28 Apr
Under cover: 30 Jan to 26 May
First harvest: About 130 days after sowing. Sown on 27 February, ready around 7 July.
Warmth: Hardy: grows once days average 5°C.

Celery across the UK, town by town

Beans and peas

Runner beanOutdoors 13 May to 28 Jun; Under cover 15 Apr to 26 Jul

Sow outdoors: 13 May to 28 Jun
Under cover: 15 Apr to 26 Jul
First harvest: About 87 days after sowing. Sown on 13 May, ready around 8 August.
Warmth: Tender: needs days averaging 11°C or more, and no frost.

Runner bean across the UK, town by town

French beanOutdoors 13 May to 13 Jul; Under cover 15 Apr to 10 Aug

Sow outdoors: 13 May to 13 Jul
Under cover: 15 Apr to 10 Aug
First harvest: About 69 days after sowing. Sown on 13 May, ready around 21 July.
Warmth: Tender: needs days averaging 11°C or more, and no frost.

French bean across the UK, town by town

Broad beanOutdoors 5 Oct to 22 Nov; Under cover 7 Sep to 20 Dec

Sow outdoors: 5 Oct to 22 Nov
Under cover: 7 Sep to 20 Dec
First harvest: About 220 days after sowing. Sown on 5 October, ready around 13 May.
Warmth: Hardy: goes in as the weather cools, and grows on through winter.

Broad bean across the UK, town by town

PeaOutdoors 13 Mar to 13 Jun; Under cover 13 Feb to 11 Jul

Sow outdoors: 13 Mar to 13 Jun
Under cover: 13 Feb to 11 Jul
First harvest: About 80 days after sowing. Sown on 13 March, ready around 1 June.
Warmth: Hardy: grows once days average 6°C; bolts in hot weather.

Pea across the UK, town by town

Onion family

OnionOutdoors 8 Mar to 28 Apr; Under cover 8 Feb to 26 May

Plant outdoors: 8 Mar to 28 Apr
Under cover: 8 Feb to 26 May
First harvest: About 139 days after planting. Planted on 8 March, ready around 25 July.
Warmth: Hardy: grows once days average 6°C.

Onion across the UK, town by town

GarlicOutdoors 5 Oct to 2 Dec; Under cover 7 Sep to 30 Dec

Plant outdoors: 5 Oct to 2 Dec
Under cover: 7 Sep to 30 Dec
First harvest: About 250 days after planting. Planted on 5 October, ready around 12 June.
Warmth: Hardy: goes in as the weather cools, and grows on through winter.

Garlic across the UK, town by town

LeekOutdoors 13 Mar to 28 Jun; Under cover 13 Feb to 26 Jul

Sow outdoors: 13 Mar to 28 Jun
Under cover: 13 Feb to 26 Jul
First harvest: About 148 days after sowing. Sown on 13 March, ready around 8 August.
Warmth: Hardy: grows once days average 6°C.

Leek across the UK, town by town

Spring onionOutdoors 27 Feb to 3 Sep; Under cover 30 Jan to 1 Oct

Sow outdoors: 27 Feb to 3 Sep
Under cover: 30 Jan to 1 Oct
First harvest: About 71 days after sowing. Sown on 27 February, ready around 9 May.
Warmth: Hardy: grows once days average 5°C.

Spring onion across the UK, town by town

ShallotOutdoors 12 Feb to 27 Apr; Under cover 15 Jan to 25 May

Plant outdoors: 12 Feb to 27 Apr
Under cover: 15 Jan to 25 May
First harvest: About 129 days after planting. Planted on 12 February, ready around 21 June.
Warmth: Hardy: grows once days average 5°C.

Shallot across the UK, town by town

Brassicas

CabbageOutdoors 13 Mar to 13 Jul; Under cover 13 Feb to 10 Aug

Sow outdoors: 13 Mar to 13 Jul
Under cover: 13 Feb to 10 Aug
First harvest: About 110 days after sowing. Sown on 13 March, ready around 1 July.
Warmth: Hardy: grows once days average 6°C.

Cabbage across the UK, town by town

BroccoliOutdoors 29 Mar to 27 Jun; Under cover 1 Mar to 25 Jul

Sow outdoors: 29 Mar to 27 Jun
Under cover: 1 Mar to 25 Jul
First harvest: About 90 days after sowing. Sown on 29 March, ready around 27 June.
Warmth: Hardy: grows once days average 7°C.

Broccoli across the UK, town by town

CauliflowerOutdoors 13 Mar to 13 Jun; Under cover 13 Feb to 11 Jul

Sow outdoors: 13 Mar to 13 Jun
Under cover: 13 Feb to 11 Jul
First harvest: About 120 days after sowing. Sown on 13 March, ready around 11 July.
Warmth: Hardy: grows once days average 6°C; bolts in hot weather.

Cauliflower across the UK, town by town

Brussels sproutOutdoors 13 Mar to 13 May; Under cover 13 Feb to 10 Jun

Sow outdoors: 13 Mar to 13 May
Under cover: 13 Feb to 10 Jun
First harvest: About 176 days after sowing. Sown on 13 March, ready around 5 September.
Warmth: Hardy: grows once days average 6°C.

Brussels sprout across the UK, town by town

KaleOutdoors 29 Mar to 12 Jul; Under cover 1 Mar to 9 Aug

Sow outdoors: 29 Mar to 12 Jul
Under cover: 1 Mar to 9 Aug
First harvest: About 80 days after sowing. Sown on 29 March, ready around 17 June.
Warmth: Hardy: grows once days average 7°C.

Kale across the UK, town by town

Pak choiOutdoors 12 Apr to 3 Sep; Under cover 15 Mar to 1 Oct

Sow outdoors: 12 Apr to 3 Sep
Under cover: 15 Mar to 1 Oct
First harvest: About 45 days after sowing. Sown on 12 April, ready around 27 May.
Warmth: Hardy: grows once days average 8°C; bolts in hot weather.

Pak choi across the UK, town by town

Herbs

BasilOutdoors 14 Apr to 14 Jul; Under cover 17 Mar to 11 Aug

Sow outdoors: 14 Apr to 14 Jul
Under cover: 17 Mar to 11 Aug
First harvest: About 60 days after sowing. Sown on 14 April, ready around 13 June.
Warmth: Tender: needs days averaging 8°C or more, and no frost.

Basil across the UK, town by town

ParsleyOutdoors 13 Mar to 18 Aug; Under cover 13 Feb to 15 Sep

Sow outdoors: 13 Mar to 18 Aug
Under cover: 13 Feb to 15 Sep
First harvest: About 76 days after sowing. Sown on 13 March, ready around 28 May.
Warmth: Hardy: grows once days average 6°C.

Parsley across the UK, town by town

CorianderOutdoors 29 Mar to 3 Sep; Under cover 1 Mar to 1 Oct

Sow outdoors: 29 Mar to 3 Sep
Under cover: 1 Mar to 1 Oct
First harvest: About 51 days after sowing. Sown on 29 March, ready around 19 May.
Warmth: Hardy: grows once days average 7°C; bolts in hot weather.

Coriander across the UK, town by town

ChivesOutdoors 13 Mar to 29 May; Under cover 13 Feb to 26 Jun

Sow outdoors: 13 Mar to 29 May
Under cover: 13 Feb to 26 Jun
First harvest: Crops every year once it’s established.
Warmth: Hardy: grows once days average 6°C.

Chives across the UK, town by town

MintOutdoors 29 Mar to 2 Oct; Under cover 1 Mar to 30 Oct

Sow outdoors: 29 Mar to 2 Oct
Under cover: 1 Mar to 30 Oct
First harvest: Crops every year once it’s established.
Warmth: Hardy: grows once days average 7°C.

Mint across the UK, town by town

Fruit

StrawberryOutdoors 13 Mar to 13 May; Under cover 13 Feb to 10 Jun

Plant outdoors: 13 Mar to 13 May
Under cover: 13 Feb to 10 Jun
First harvest: Crops every year once it’s established.
Warmth: Hardy: grows once days average 6°C.

Strawberry across the UK, town by town

RaspberryOutdoors 3 Nov to 2 Jan; Under cover 6 Oct to 30 Jan

Plant outdoors: 3 Nov to 2 Jan
Under cover: 6 Oct to 30 Jan
First harvest: Crops every year once it’s established.
Warmth: Hardy: goes in as the weather cools, and grows on through winter.

Raspberry across the UK, town by town

RhubarbOutdoors 18 Oct to 17 Dec; Under cover 20 Sep to 14 Jan

Plant outdoors: 18 Oct to 17 Dec
Under cover: 20 Sep to 14 Jan
First harvest: Crops every year once it’s established.
Warmth: Hardy: goes in as the weather cools, and grows on through winter.

Rhubarb across the UK, town by town

Nearby

Also covers

Dunstable, Barnet, Muswell Hill, and nearby villages. Dates are within a few days across the area.

Questions about growing in Hemel Hempstead

When is the last frost in Hemel Hempstead?

On average around 14 April, and the first autumn frost comes around 12 November. 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 Hemel Hempstead?

Yes. Plant them outdoors 19 May to 13 Jun, or under cover 21 Apr to 11 Jul.

What can I sow in Hemel Hempstead in November?

Outdoors: broad bean, 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 plot in Hemel Hempstead. 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