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Method
Rel. frost
Last spring frost (0°C) 21 May Frost 1 of 10 years · 20 years of data
Frost-free season 149 days 21 May – 17 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)
2 – 16 Apr
15 Jun
5-7 wk
21 May
20 Jul
0 wk
25 May
10 Jul
1 wk after
Broccoli
Brassica oleracea (Italica-gruppen)
9 – 23 Apr
27 Jun
4-6 wk
21 May
25 Jul
0 wk
25 May
15 Jul
1 wk after
Chili pepper
Capsicum annuum
Season too short
13 Mar – 10 Apr
15 Mar
8-12 wk
5 Jun
2 wk after
Curly Kale
Brassica oleracea (Curly Kale-gruppen)
2 – 16 Apr
10 Jun
5-7 wk
21 May
15 Jul
0 wk
21 May
5 Jul
0 wk
Garden cucumber
Cucumis sativus
Fleece
20 – 27 May
3-4 wk
17 Jun
4 wk after
Florence Fennel
Foeniculum vulgare
29 May – 5 Jun
7 Jun
4-5 wk
3 Jul
5 Jul
6 wk after
9 Jul
7 wk after
Butter bean
Phaseolus lunatus
Season too short
10 – 17 Jun
3-4 wk
8 Jul
7 wk after
Onion
Allium cepa (Cepa-gruppen)
26 Feb – 26 Mar
31 Mar
8-12 wk
21 May
26 May
0 wk
11 Jun
3 wk after
Onion (sets)
Allium cepa (Cepa-gruppen)
25 May
15 Jun
1 wk after
25 May
5 Jun
1 wk after
Maize
Zea mays
Fleece
8 – 15 May
3-4 wk
5 Jun
2 wk after
Swiss Chard
Beta vulgaris (Flavescens-gruppen)
1 – 8 May
4 Jul
3-4 wk
29 May
25 Jul
1 wk after
11 Jun
15 Jul
3 wk after
Carrot
Daucus carota subsp. sativus var. sativus
21 May
5 Jul
0 wk
21 May
25 Jun
0 wk
Palm Kale
Brassica oleracea (Palm Kale-gruppen)
2 – 16 Apr
10 Jun
5-7 wk
21 May
15 Jul
0 wk
21 May
5 Jul
0 wk
Potato
Solanum tuberosum
25 Apr – 9 May
7 Jun
4-6 wk
6 Jun
5 Jul
2 wk after
6 Jun
25 Jun
2 wk after
Ornamental Kale
Brassica oleracea (Ornamental-gruppen)
2 – 16 Apr
20 Jun
5-7 wk
21 May
25 Jul
0 wk
25 May
15 Jul
1 wk after
Pumpkin
Cucurbita pepo
5 – 12 Jun
3-4 wk
3 Jul
6 wk after
Beetroot
Beta vulgaris (Conditiva-gruppen)
1 – 8 May
26 Jun
3-4 wk
29 May
17 Jul
1 wk after
11 Jun
7 Jul
3 wk after
Red Cabbage
Brassica oleracea (Red Cabbage-gruppen)
9 – 23 Apr
22 Jun
4-6 wk
21 May
20 Jul
0 wk
Lettuce
Lactuca sativa
23 – 30 Apr
9 Jul
3-4 wk
21 May
30 Jul
0 wk
25 May
20 Jul
1 wk after
Savoy Cabbage
Brassica oleracea (Savoy Cabbage-gruppen)
9 – 23 Apr
22 Jun
4-6 wk
21 May
20 Jul
0 wk
Shallot (bulbs)
Allium cepa (Aggregatum-gruppen)
23 Apr – 7 May
1 Jun
2-4 wk
21 May
15 Jun
0 wk
21 May
5 Jun
0 wk
Shallot (sets)
Allium cepa (Aggregatum-gruppen)
25 May
15 Jun
1 wk after
25 May
5 Jun
1 wk after
Spinach
Spinacia oleracea
23 – 30 Apr
24 Jul
3-4 wk
21 May
14 Aug
0 wk
17 May
4 Aug
1 wk before
Sweet potato
Ipomoea batatas
22 Jun – 6 Jul
4-6 wk
3 Aug
11 wk after
Garden tomato
Solanum lycopersicum
Fleece
10 – 24 Apr
6-8 wk
5 Jun
2 wk after
Tomatillo
Physalis ixocarpa
Common Bean
Phaseolus vulgaris
20 May – 3 Jun
2-4 wk
17 Jun
4 wk after
9 Jul
7 wk after
White Cabbage
Brassica oleracea (White Cabbage-gruppen)
9 – 23 Apr
22 Jun
4-6 wk
21 May
20 Jul
0 wk
Garden pea
Pisum sativum
23 – 30 Apr
24 Jun
3-4 wk
21 May
15 Jul
0 wk
25 May
5 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
6 – 20 May
13 May
4-6 wk
17 Jun
4 wk after
Lemon balm
Melissa officinalis
12 – 26 Mar
20 May
8-10 wk
21 May
15 Jul
0 wk
25 Jun
5 Jul
5 wk after
Dill
Anethum graveolens
25 May
25 Jul
1 wk after
Wild chives
Allium schoenoprasum
26 Mar – 9 Apr
3 Jun
6-8 wk
21 May
15 Jul
0 wk
25 May
5 Jul
1 wk after
Spearmint
Mentha spicata
26 Feb – 26 Mar
20 May
8-12 wk
21 May
15 Jul
0 wk
25 Jun
5 Jul
5 wk after
Coriander
Coriandrum sativum
21 May
14 Aug
0 wk
11 Jun
4 Aug
3 wk after
Garden sage
Salvia officinalis
20 Mar – 3 Apr
5 May
8-10 wk
29 May
30 Jun
1 wk after
Common thyme
Thymus vulgaris
12 – 26 Mar
10 May
8-10 wk
21 May
5 Jul
0 wk
Oregano
Origanum vulgare
26 Mar – 9 Apr
24 May
6-8 wk
21 May
5 Jul
0 wk
25 Jun
25 Jun
5 wk after
Parsley
Petroselinum crispum
26 Mar – 9 Apr
24 May
6-8 wk
21 May
5 Jul
0 wk
25 May
25 Jun
1 wk after
Rosemary
Salvia rosmarinus
20 Feb – 20 Mar
6 Apr
10-14 wk
29 May
15 Jun
1 wk after

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