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Method
Rel. frost
Last spring frost (0°C) 5 May Frost 3 of 4 years · 20 years of data
Frost-free season 144 days 5 May – 26 Sep
Probability that frost is over

25% = 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)
17 – 31 Mar
12 Jun
5-7 wk
5 May
17 Jul
0 wk
6 May
7 Jul
0 wk
Broccoli
Brassica oleracea (Italica-gruppen)
24 Mar – 7 Apr
24 Jun
4-6 wk
5 May
22 Jul
0 wk
6 May
12 Jul
0 wk
Chili pepper
Capsicum annuum
Greenhouse
21 Feb – 21 Mar
31 Mar
8-12 wk
16 May
26 May
2 wk after
Curly Kale
Brassica oleracea (Curly Kale-gruppen)
17 – 31 Mar
7 Jun
5-7 wk
5 May
12 Jul
0 wk
5 May
2 Jul
0 wk
Garden cucumber
Cucumis sativus
11 – 18 May
20 May
3-4 wk
8 Jun
10 Jun
5 wk after
Florence Fennel
Foeniculum vulgare
4 – 11 May
24 May
4-5 wk
8 Jun
21 Jun
5 wk after
17 Jun
6 wk after
Butter bean
Phaseolus lunatus
Season too short
18 – 25 May
3-4 wk
15 Jun
6 wk after
Onion
Allium cepa (Cepa-gruppen)
10 Feb – 10 Mar
25 Mar
8-12 wk
5 May
20 May
0 wk
18 May
2 wk after
Onion (sets)
Allium cepa (Cepa-gruppen)
6 May
9 Jun
0 wk
6 May
30 May
0 wk
Maize
Zea mays
27 Apr – 4 May
10 May
3-4 wk
25 May
31 May
3 wk after
Swiss Chard
Beta vulgaris (Flavescens-gruppen)
13 – 20 Apr
1 Jul
3-4 wk
11 May
22 Jul
1 wk after
18 May
12 Jul
2 wk after
Carrot
Daucus carota subsp. sativus var. sativus
5 May
2 Jul
0 wk
5 May
22 Jun
0 wk
Palm Kale
Brassica oleracea (Palm Kale-gruppen)
17 – 31 Mar
7 Jun
5-7 wk
5 May
12 Jul
0 wk
5 May
2 Jul
0 wk
Potato
Solanum tuberosum
3 – 17 Apr
23 May
4-6 wk
15 May
20 Jun
1 wk after
15 May
10 Jun
1 wk after
Ornamental Kale
Brassica oleracea (Ornamental-gruppen)
17 – 31 Mar
17 Jun
5-7 wk
5 May
22 Jul
0 wk
6 May
12 Jul
0 wk
Pumpkin
Cucurbita pepo
11 – 18 May
30 May
3-4 wk
8 Jun
20 Jun
5 wk after
Beetroot
Beta vulgaris (Conditiva-gruppen)
13 – 20 Apr
27 May
3-4 wk
11 May
17 Jun
1 wk after
18 May
7 Jun
2 wk after
Red Cabbage
Brassica oleracea (Red Cabbage-gruppen)
24 Mar – 7 Apr
19 Jun
4-6 wk
5 May
17 Jul
0 wk
Lettuce
Lactuca sativa
7 – 14 Apr
6 Jul
3-4 wk
5 May
27 Jul
0 wk
6 May
17 Jul
0 wk
Savoy Cabbage
Brassica oleracea (Savoy Cabbage-gruppen)
24 Mar – 7 Apr
19 Jun
4-6 wk
5 May
17 Jul
0 wk
Shallot (bulbs)
Allium cepa (Aggregatum-gruppen)
7 – 21 Apr
29 May
2-4 wk
5 May
12 Jun
0 wk
5 May
2 Jun
0 wk
Shallot (sets)
Allium cepa (Aggregatum-gruppen)
6 May
9 Jun
0 wk
6 May
30 May
0 wk
Spinach
Spinacia oleracea
7 – 14 Apr
21 Jul
3-4 wk
5 May
11 Aug
0 wk
2 May
1 Aug
0 wk
Sweet potato
Ipomoea batatas
30 May – 13 Jun
4-6 wk
11 Jul
10 wk after
Garden tomato
Solanum lycopersicum
30 Mar – 13 Apr
19 Apr
6-8 wk
25 May
31 May
3 wk after
Tomatillo
Physalis ixocarpa
Common Bean
Phaseolus vulgaris
27 Apr – 11 May
1 Jun
2-4 wk
25 May
15 Jun
3 wk after
17 Jun
6 wk after
White Cabbage
Brassica oleracea (White Cabbage-gruppen)
24 Mar – 7 Apr
19 Jun
4-6 wk
5 May
17 Jul
0 wk
Garden pea
Pisum sativum
7 – 14 Apr
21 Jun
3-4 wk
5 May
12 Jul
0 wk
6 May
2 Jul
0 wk

Herbs

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