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Method
Rel. frost
Last spring frost (0°C) 23 May Frost 1 of 10 years · 20 years of data
Frost-free season 149 days 23 May – 19 Oct
Probability that frost is over

90% = Half of years are frost-free by this date. More about frost & season →

Custom date

Vegetables

Plant Sow indoors Transplant Direct sow
Earliest Latest Growing time Earliest Latest Rel. frost Earliest Latest Rel. frost
Cauliflower
Brassica oleracea (Botrytis-gruppen)
4 – 18 Apr
14 Jun
5-7 wk
23 May
19 Jul
0 wk
27 May
9 Jul
1 wk after
Broccoli
Brassica oleracea (Italica-gruppen)
11 – 25 Apr
26 Jun
4-6 wk
23 May
24 Jul
0 wk
27 May
14 Jul
1 wk after
Chili pepper
Capsicum annuum
Season too short
6 Mar – 3 Apr
8-12 wk
29 May
1 wk after
Curly Kale
Brassica oleracea (Curly Kale-gruppen)
4 – 18 Apr
9 Jun
5-7 wk
23 May
14 Jul
0 wk
23 May
4 Jul
0 wk
Garden cucumber
Cucumis sativus
Greenhouse
1 – 8 May
21 May
3-4 wk
29 May
11 Jun
1 wk after
Florence Fennel
Foeniculum vulgare
20 – 27 May
6 Jun
4-5 wk
24 Jun
4 Jul
5 wk after
11 Jul
7 wk after
Butter bean
Phaseolus lunatus
Season too short
3 – 10 Jun
3-4 wk
1 Jul
6 wk after
Onion
Allium cepa (Cepa-gruppen)
28 Feb – 28 Mar
30 Mar
8-12 wk
23 May
25 May
0 wk
13 Jun
3 wk after
Onion (sets)
Allium cepa (Cepa-gruppen)
27 May
14 Jun
1 wk after
27 May
4 Jun
1 wk after
Maize
Zea mays
Greenhouse
25 Apr – 2 May
11 May
3-4 wk
23 May
1 Jun
0 wk
Swiss Chard
Beta vulgaris (Flavescens-gruppen)
27 Apr – 4 May
3 Jul
3-4 wk
25 May
24 Jul
0 wk
13 Jun
14 Jul
3 wk after
Carrot
Daucus carota subsp. sativus var. sativus
23 May
4 Jul
0 wk
23 May
24 Jun
0 wk
Palm Kale
Brassica oleracea (Palm Kale-gruppen)
4 – 18 Apr
9 Jun
5-7 wk
23 May
14 Jul
0 wk
23 May
4 Jul
0 wk
Potato
Solanum tuberosum
27 Apr – 11 May
5 Jun
4-6 wk
8 Jun
3 Jul
2 wk after
8 Jun
23 Jun
2 wk after
Ornamental Kale
Brassica oleracea (Ornamental-gruppen)
4 – 18 Apr
19 Jun
5-7 wk
23 May
24 Jul
0 wk
27 May
14 Jul
1 wk after
Pumpkin
Cucurbita pepo
Fleece
8 – 15 May
26 May
3-4 wk
5 Jun
16 Jun
2 wk after
Beetroot
Beta vulgaris (Conditiva-gruppen)
27 Apr – 4 May
16 Jun
3-4 wk
25 May
7 Jul
0 wk
13 Jun
27 Jun
3 wk after
Red Cabbage
Brassica oleracea (Red Cabbage-gruppen)
11 – 25 Apr
21 Jun
4-6 wk
23 May
19 Jul
0 wk
Lettuce
Lactuca sativa
25 Apr – 2 May
8 Jul
3-4 wk
23 May
29 Jul
0 wk
27 May
19 Jul
1 wk after
Savoy Cabbage
Brassica oleracea (Savoy Cabbage-gruppen)
11 – 25 Apr
21 Jun
4-6 wk
23 May
19 Jul
0 wk
Shallot (bulbs)
Allium cepa (Aggregatum-gruppen)
25 Apr – 9 May
31 May
2-4 wk
23 May
14 Jun
0 wk
23 May
4 Jun
0 wk
Shallot (sets)
Allium cepa (Aggregatum-gruppen)
27 May
14 Jun
1 wk after
27 May
4 Jun
1 wk after
Spinach
Spinacia oleracea
25 Apr – 2 May
23 Jul
3-4 wk
23 May
13 Aug
0 wk
19 May
3 Aug
1 wk before
Sweet potato
Ipomoea batatas
24 Jun – 8 Jul
4-6 wk
5 Aug
11 wk after
Garden tomato
Solanum lycopersicum
Greenhouse
28 Mar – 11 Apr
20 Apr
6-8 wk
23 May
1 Jun
0 wk
Tomatillo
Physalis ixocarpa
Common Bean
Phaseolus vulgaris
Fleece
1 – 15 May
28 May
2-4 wk
29 May
11 Jun
1 wk after
27 Jun
5 wk after
White Cabbage
Brassica oleracea (White Cabbage-gruppen)
11 – 25 Apr
21 Jun
4-6 wk
23 May
19 Jul
0 wk
Garden pea
Pisum sativum
25 Apr – 2 May
23 Jun
3-4 wk
23 May
14 Jul
0 wk
27 May
4 Jul
1 wk after

Herbs

Plant Sow indoors Transplant Direct sow
Earliest Latest Growing time Earliest Latest Rel. frost Earliest Latest Rel. frost
Basil
Ocimum basilicum
Fleece
24 Apr – 8 May
4 May
4-6 wk
5 Jun
2 wk after
Lemon balm
Melissa officinalis
14 – 28 Mar
19 May
8-10 wk
23 May
14 Jul
0 wk
27 Jun
4 Jul
5 wk after
Dill
Anethum graveolens
27 May
24 Jul
1 wk after
Wild chives
Allium schoenoprasum
28 Mar – 11 Apr
2 Jun
6-8 wk
23 May
14 Jul
0 wk
27 May
4 Jul
1 wk after
Spearmint
Mentha spicata
28 Feb – 28 Mar
19 May
8-12 wk
23 May
14 Jul
0 wk
27 Jun
4 Jul
5 wk after
Coriander
Coriandrum sativum
23 May
13 Aug
0 wk
13 Jun
3 Aug
3 wk after
Garden sage
Salvia officinalis
16 – 30 Mar
4 May
8-10 wk
25 May
29 Jun
0 wk
Common thyme
Thymus vulgaris
14 – 28 Mar
9 May
8-10 wk
23 May
4 Jul
0 wk
Oregano
Origanum vulgare
28 Mar – 11 Apr
23 May
6-8 wk
23 May
4 Jul
0 wk
27 Jun
5 wk after
Parsley
Petroselinum crispum
28 Mar – 11 Apr
23 May
6-8 wk
23 May
4 Jul
0 wk
27 May
24 Jun
1 wk after
Rosemary
Salvia rosmarinus
16 Feb – 16 Mar
5 Apr
10-14 wk
25 May
14 Jun
0 wk

Annual flowers

Plant Sow indoors Transplant Direct sow
Earliest Latest Growing time Earliest Latest Rel. frost Earliest Latest Rel. frost
Morning glory
Ipomoea tricolor
Fleece
8 – 15 May
11 May
3-4 wk
5 Jun
2 wk after
Cornflower
Centaurea cyanus
23 May
14 Jul
0 wk
27 May
4 Jul
1 wk after
Statice
Limonium sinuatum
27 Mar – 10 Apr
8 Apr
8-10 wk
5 Jun
2 wk after
Sweet William
Dianthus barbatus
28 Mar – 11 Apr
6-8 wk
23 May
0 wk
8 Jun
2 wk after
Snow-on-the-mountain
Euphorbia marginata
10 – 24 Apr
22 Apr
6-8 wk
5 Jun
2 wk after
5 Aug
11 wk after
Pinnate dahlia
Dahlia × pinnata
8 – 22 Apr
28 Apr
6-8 wk
3 Jun
9 Jun
2 wk after
Pinnate dahlia (tubers)
Dahlia × pinnata
2 – 30 May
12 May
4-8 wk
27 Jun
5 wk after
27 Jun
5 wk after
Foxglove
Digitalis purpurea
14 – 28 Mar
8-10 wk
23 May
0 wk
13 Jun
3 wk after
Busy lizzie
Impatiens walleriana
1 – 29 Apr
22 May
8-12 wk
24 Jun
17 Jul
5 wk after
Creeping zinnia
Sanvitalia procumbens
10 – 24 Apr
2 May
6-8 wk
5 Jun
13 Jun
2 wk after
Hyacinth bean
Dolichos lablab
Season too short
24 Apr – 8 May
4-6 wk
5 Jun
2 wk after
Chinese lantern
Physalis alkekengi
16 – 30 Mar
19 Apr
8-10 wk
25 May
14 Jun
0 wk
Love in a mist
Nigella damascena
23 May
29 Jun
0 wk
27 May
19 Jun
1 wk after
Strawflower
Xerochrysum bracteatum
10 – 24 Apr
12 Apr
6-8 wk
5 Jun
2 wk after
5 Aug
11 wk after
Purple-top vervain
Verbena bonariensis
2 – 30 Mar
19 Apr
8-12 wk
25 May
14 Jun
0 wk
Cardoon
Cynara cardunculus
13 Mar – 10 Apr
20 Mar
8-12 wk
5 Jun
2 wk after
Regal-foxtail
Ptilotus nobilis
Greenhouse
6 Mar – 3 Apr
14 Apr
8-12 wk
29 May
9 Jun
1 wk after
Globe amaranth
Gomphrena globosa
Greenhouse
3 – 17 Apr
28 Apr
6-8 wk
29 May
9 Jun
1 wk after
Corn poppy
Papaver rhoeas
23 May
14 Jul
0 wk
27 May
4 Jul
1 wk after
Snapdragon
Antirrhinum majus
28 Feb – 28 Mar
9 May
8-12 wk
23 May
4 Jul
0 wk
8 Jun
24 Jun
2 wk after
Flossflower
Ageratum houstonianum
15 – 29 Apr
18 Apr
8-10 wk
24 Jun
5 wk after
Sweet pea
Lathyrus odoratus
28 Mar – 18 Apr
30 May
5-8 wk
23 May
4 Jul
0 wk
Stock
Matthiola incana
28 Mar – 11 Apr
2 Jun
6-8 wk
23 May
14 Jul
0 wk
13 Jun
4 Jul
3 wk after
Wormwood
Artemisia absinthium
28 Mar – 11 Apr
3 May
6-8 wk
23 May
14 Jun
0 wk
13 Jun
3 wk after
Mexican sunflower
Tithonia rotundifolia
Greenhouse
17 Apr – 1 May
7 May
4-6 wk
29 May
4 Jun
1 wk after
Garden pansy
Viola × wittrockiana
14 – 28 Mar
19 May
8-10 wk
23 May
14 Jul
0 wk
8 Jun
4 Jul
2 wk after
Petunia
Petunia
13 Mar – 10 Apr
8 Apr
8-12 wk
5 Jun
2 wk after
Sweet Scabious
Scabiosa atropurpurea
30 Mar – 13 Apr
3 May
6-8 wk
25 May
14 Jun
0 wk
11 Jul
7 wk after
Common zinnia
Zinnia elegans
24 Apr – 8 May
4 May
4-6 wk
5 Jun
2 wk after
Common morning glory
Ipomoea purpurea
Fleece
1 – 15 May
11 May
3-5 wk
5 Jun
2 wk after
Garden cosmos
Cosmos bipinnatus
24 Apr – 8 May
12 May
4-6 wk
5 Jun
9 Jun
2 wk after
11 Jul
7 wk after
Scarlet milkweed
Asclepias curassavica
Fleece
1 – 29 Apr
26 Apr
8-12 wk
24 Jun
5 wk after
Bee balm
Monarda didyma
28 Feb – 28 Mar
19 Apr
8-12 wk
23 May
14 Jun
0 wk
27 Jun
5 wk after
Yarrow
Achillea millefolium
28 Mar – 11 Apr
3 Apr
6-8 wk
23 May
0 wk
13 Jun
3 wk after
Safflower
Carthamus tinctorius
23 May
14 Jun
0 wk
27 May
4 Jun
1 wk after
Iceland poppy
Papaver nudicaule
Season too short
28 Mar – 11 Apr
23 May
6-8 wk
23 May
4 Jul
0 wk
5 May
24 Jun
3 wk before
Bishop's flower
Ammi majus
11 – 25 Apr
6 Jun
4-6 wk
23 May
4 Jul
0 wk
13 Jun
24 Jun
3 wk after
Drumsticks
Pycnosorus globosus
Greenhouse
6 – 20 Mar
29 Mar
10-12 wk
29 May
7 Jun
1 wk after
Sunflower
Helianthus annuus
8 – 15 May
13 Jun
3-4 wk
5 Jun
4 Jul
2 wk after
27 Jun
5 wk after
China aster
Callistephus chinensis
10 – 24 Apr
2 Jun
6-8 wk
5 Jun
14 Jul
2 wk after
11 Jul
7 wk after
Annual phlox
Phlox drummondii
3 – 17 Apr
2 May
6-8 wk
29 May
13 Jun
1 wk after
11 Jul
7 wk after
Hollyhock
Alcea rosea
28 Mar – 11 Apr
6-8 wk
23 May
0 wk
13 Jun
3 wk after
Alpine delphinium
Delphinium elatum
28 Feb – 28 Mar
19 Apr
8-12 wk
23 May
14 Jun
0 wk
27 Jun
5 wk after
African marigold
Tagetes erecta
10 – 24 Apr
2 May
6-8 wk
5 Jun
13 Jun
2 wk after
Black-eyed Susan
Rudbeckia hirta
30 Mar – 13 Apr
23 May
6-8 wk
25 May
4 Jul
0 wk
11 Jul
7 wk after
Wood sage
Salvia nemorosa
14 – 28 Mar
9 Apr
8-10 wk
23 May
4 Jun
0 wk
27 Jun
5 wk after
Black-eyed susan vine
Thunbergia alata
Fleece
27 Mar – 24 Apr
20 Apr
6-10 wk
5 Jun
2 wk after
California goldenpoppy
Eschscholzia californica
23 May
14 Jul
0 wk
27 May
4 Jul
1 wk after
Painted tongue
Salpiglossis sinuata
27 Mar – 10 Apr
9 May
8-10 wk
5 Jun
4 Jul
2 wk after
Water forget-me-not
Myosotis scorpioides
28 Mar – 11 Apr
3 May
6-8 wk
23 May
14 Jun
0 wk
13 Jun
3 wk after