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Method
Rel. frost
Last spring frost (0°C) 21 May Frost 1 of 4 years · 20 years of data
Frost-free season 145 days 21 May – 13 Oct
Probability that frost is over

75% = 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
14 Jun
5-7 wk
21 May
19 Jul
0 wk
22 May
9 Jul
0 wk
Broccoli
Brassica oleracea (Italica-gruppen)
9 – 23 Apr
26 Jun
4-6 wk
21 May
24 Jul
0 wk
22 May
14 Jul
0 wk
Chili pepper
Capsicum annuum
Greenhouse
9 Mar – 6 Apr
19 Apr
8-12 wk
1 Jun
14 Jun
2 wk after
Curly Kale
Brassica oleracea (Curly Kale-gruppen)
2 – 16 Apr
9 Jun
5-7 wk
21 May
14 Jul
0 wk
21 May
4 Jul
0 wk
Garden cucumber
Cucumis sativus
27 May – 3 Jun
28 May
3-4 wk
24 Jun
5 wk after
Florence Fennel
Foeniculum vulgare
20 – 27 May
6 Jun
4-5 wk
24 Jun
4 Jul
5 wk after
3 Jul
6 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)
26 Feb – 26 Mar
30 Mar
8-12 wk
21 May
25 May
0 wk
3 Jun
2 wk after
Onion (sets)
Allium cepa (Cepa-gruppen)
22 May
14 Jun
0 wk
22 May
4 Jun
0 wk
Maize
Zea mays
13 – 20 May
18 May
3-4 wk
10 Jun
3 wk after
Swiss Chard
Beta vulgaris (Flavescens-gruppen)
29 Apr – 6 May
3 Jul
3-4 wk
27 May
24 Jul
1 wk after
3 Jun
14 Jul
2 wk after
Carrot
Daucus carota subsp. sativus var. sativus
21 May
4 Jul
0 wk
21 May
24 Jun
0 wk
Palm Kale
Brassica oleracea (Palm Kale-gruppen)
2 – 16 Apr
9 Jun
5-7 wk
21 May
14 Jul
0 wk
21 May
4 Jul
0 wk
Potato
Solanum tuberosum
19 Apr – 3 May
1 Jun
4-6 wk
31 May
29 Jun
1 wk after
31 May
19 Jun
1 wk after
Ornamental Kale
Brassica oleracea (Ornamental-gruppen)
2 – 16 Apr
19 Jun
5-7 wk
21 May
24 Jul
0 wk
22 May
14 Jul
0 wk
Pumpkin
Cucurbita pepo
27 May – 3 Jun
18 Jun
3-4 wk
24 Jun
9 Jul
5 wk after
Beetroot
Beta vulgaris (Conditiva-gruppen)
29 Apr – 6 May
16 Jun
3-4 wk
27 May
7 Jul
1 wk after
3 Jun
27 Jun
2 wk after
Red Cabbage
Brassica oleracea (Red Cabbage-gruppen)
9 – 23 Apr
21 Jun
4-6 wk
21 May
19 Jul
0 wk
Lettuce
Lactuca sativa
23 – 30 Apr
8 Jul
3-4 wk
21 May
29 Jul
0 wk
22 May
19 Jul
0 wk
Savoy Cabbage
Brassica oleracea (Savoy Cabbage-gruppen)
9 – 23 Apr
21 Jun
4-6 wk
21 May
19 Jul
0 wk
Shallot (bulbs)
Allium cepa (Aggregatum-gruppen)
23 Apr – 7 May
31 May
2-4 wk
21 May
14 Jun
0 wk
21 May
4 Jun
0 wk
Shallot (sets)
Allium cepa (Aggregatum-gruppen)
22 May
14 Jun
0 wk
22 May
4 Jun
0 wk
Spinach
Spinacia oleracea
23 – 30 Apr
23 Jul
3-4 wk
21 May
13 Aug
0 wk
18 May
3 Aug
0 wk
Sweet potato
Ipomoea batatas
15 – 29 Jun
4-6 wk
27 Jul
10 wk after
Garden tomato
Solanum lycopersicum
15 – 29 Apr
27 Apr
6-8 wk
10 Jun
3 wk after
Tomatillo
Physalis ixocarpa
Common Bean
Phaseolus vulgaris
13 – 27 May
20 Jun
2-4 wk
10 Jun
4 Jul
3 wk after
3 Jul
6 wk after
White Cabbage
Brassica oleracea (White Cabbage-gruppen)
9 – 23 Apr
21 Jun
4-6 wk
21 May
19 Jul
0 wk
Garden pea
Pisum sativum
23 – 30 Apr
23 Jun
3-4 wk
21 May
14 Jul
0 wk
22 May
4 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
13 – 27 May
27 May
4-6 wk
24 Jun
24 Jun
5 wk after
Lemon balm
Melissa officinalis
12 – 26 Mar
19 May
8-10 wk
21 May
14 Jul
0 wk
15 Jun
4 Jul
4 wk after
Dill
Anethum graveolens
22 May
24 Jul
0 wk
Wild chives
Allium schoenoprasum
26 Mar – 9 Apr
2 Jun
6-8 wk
21 May
14 Jul
0 wk
22 May
4 Jul
0 wk
Spearmint
Mentha spicata
26 Feb – 26 Mar
19 May
8-12 wk
21 May
14 Jul
0 wk
15 Jun
4 Jul
4 wk after
Coriander
Coriandrum sativum
21 May
13 Aug
0 wk
3 Jun
3 Aug
2 wk after
Garden sage
Salvia officinalis
18 Mar – 1 Apr
4 May
8-10 wk
27 May
29 Jun
1 wk after
Common thyme
Thymus vulgaris
12 – 26 Mar
9 May
8-10 wk
21 May
4 Jul
0 wk
Oregano
Origanum vulgare
26 Mar – 9 Apr
23 May
6-8 wk
21 May
4 Jul
0 wk
15 Jun
24 Jun
4 wk after
Parsley
Petroselinum crispum
26 Mar – 9 Apr
23 May
6-8 wk
21 May
4 Jul
0 wk
22 May
24 Jun
0 wk
Rosemary
Salvia rosmarinus
18 Feb – 18 Mar
5 Apr
10-14 wk
27 May
14 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
27 May – 3 Jun
3 Jun
3-4 wk
24 Jun
24 Jun
5 wk after
Cornflower
Centaurea cyanus
21 May
14 Jul
0 wk
22 May
4 Jul
0 wk
Statice
Limonium sinuatum
1 – 15 Apr
6 May
8-10 wk
10 Jun
1 Jul
3 wk after
Sweet William
Dianthus barbatus
26 Mar – 9 Apr
6-8 wk
21 May
0 wk
31 May
1 wk after
Snow-on-the-mountain
Euphorbia marginata
15 – 29 Apr
20 May
6-8 wk
10 Jun
1 Jul
3 wk after
27 Jul
10 wk after
Pinnate dahlia
Dahlia × pinnata
10 – 24 Apr
23 May
6-8 wk
5 Jun
4 Jul
2 wk after
Pinnate dahlia (tubers)
Dahlia × pinnata
20 Apr – 18 May
6 Jun
4-8 wk
15 Jun
4 Jul
4 wk after
15 Jun
24 Jun
4 wk after
Foxglove
Digitalis purpurea
12 – 26 Mar
8-10 wk
21 May
0 wk
3 Jun
2 wk after
Busy lizzie
Impatiens walleriana
1 – 29 Apr
25 Jun
8-12 wk
24 Jun
20 Aug
5 wk after
Creeping zinnia
Sanvitalia procumbens
15 – 29 Apr
30 May
6-8 wk
10 Jun
11 Jul
3 wk after
Hyacinth bean
Dolichos lablab
Greenhouse
29 Apr – 13 May
8 May
4-6 wk
10 Jun
3 wk after
Chinese lantern
Physalis alkekengi
18 Mar – 1 Apr
19 Apr
8-10 wk
27 May
14 Jun
1 wk after
Love in a mist
Nigella damascena
21 May
29 Jun
0 wk
22 May
19 Jun
0 wk
Strawflower
Xerochrysum bracteatum
15 – 29 Apr
10 May
6-8 wk
10 Jun
21 Jun
3 wk after
27 Jul
10 wk after
Purple-top vervain
Verbena bonariensis
4 Mar – 1 Apr
19 Apr
8-12 wk
27 May
14 Jun
1 wk after
Cardoon
Cynara cardunculus
Fleece
9 Mar – 6 Apr
20 Mar
8-12 wk
1 Jun
2 wk after
Regal-foxtail
Ptilotus nobilis
1 – 29 Apr
19 Apr
8-12 wk
24 Jun
5 wk after
Globe amaranth
Gomphrena globosa
29 Apr – 13 May
3 May
6-8 wk
24 Jun
5 wk after
Corn poppy
Papaver rhoeas
21 May
14 Jul
0 wk
22 May
4 Jul
0 wk
Snapdragon
Antirrhinum majus
26 Feb – 26 Mar
9 May
8-12 wk
21 May
4 Jul
0 wk
31 May
24 Jun
1 wk after
Flossflower
Ageratum houstonianum
15 – 29 Apr
16 May
8-10 wk
24 Jun
11 Jul
5 wk after
Sweet pea
Lathyrus odoratus
26 Mar – 16 Apr
30 May
5-8 wk
21 May
4 Jul
0 wk
Stock
Matthiola incana
26 Mar – 9 Apr
2 Jun
6-8 wk
21 May
14 Jul
0 wk
3 Jun
4 Jul
2 wk after
Wormwood
Artemisia absinthium
26 Mar – 9 Apr
3 May
6-8 wk
21 May
14 Jun
0 wk
3 Jun
4 Jun
2 wk after
Mexican sunflower
Tithonia rotundifolia
13 – 27 May
4-6 wk
24 Jun
5 wk after
Garden pansy
Viola × wittrockiana
12 – 26 Mar
19 May
8-10 wk
21 May
14 Jul
0 wk
31 May
4 Jul
1 wk after
Petunia
Petunia
18 Mar – 15 Apr
6 May
8-12 wk
10 Jun
1 Jul
3 wk after
Sweet Scabious
Scabiosa atropurpurea
1 – 15 Apr
3 May
6-8 wk
27 May
14 Jun
1 wk after
3 Jul
6 wk after
Common zinnia
Zinnia elegans
29 Apr – 13 May
7 Jun
4-6 wk
10 Jun
5 Jul
3 wk after
Common morning glory
Ipomoea purpurea
20 May – 3 Jun
3 Jun
3-5 wk
24 Jun
24 Jun
5 wk after
Garden cosmos
Cosmos bipinnatus
29 Apr – 13 May
6 Jun
4-6 wk
10 Jun
4 Jul
3 wk after
3 Jul
6 wk after
Scarlet milkweed
Asclepias curassavica
13 Apr – 11 May
19 May
8-12 wk
6 Jul
14 Jul
7 wk after
Bee balm
Monarda didyma
26 Feb – 26 Mar
19 Apr
8-12 wk
21 May
14 Jun
0 wk
15 Jun
4 wk after
Yarrow
Achillea millefolium
26 Mar – 9 Apr
3 Apr
6-8 wk
21 May
0 wk
3 Jun
2 wk after
Safflower
Carthamus tinctorius
21 May
14 Jun
0 wk
22 May
4 Jun
0 wk
Iceland poppy
Papaver nudicaule
Season too short
26 Mar – 9 Apr
23 May
6-8 wk
21 May
4 Jul
0 wk
5 May
24 Jun
2 wk before
Bishop's flower
Ammi majus
9 – 23 Apr
6 Jun
4-6 wk
21 May
4 Jul
0 wk
3 Jun
24 Jun
2 wk after
Drumsticks
Pycnosorus globosus
1 – 15 Apr
10-12 wk
24 Jun
5 wk after
Sunflower
Helianthus annuus
13 – 20 May
13 Jun
3-4 wk
10 Jun
4 Jul
3 wk after
15 Jun
24 Jun
4 wk after
China aster
Callistephus chinensis
15 – 29 Apr
2 Jun
6-8 wk
10 Jun
14 Jul
3 wk after
3 Jul
4 Jul
6 wk after
Annual phlox
Phlox drummondii
6 – 20 Apr
30 May
6-8 wk
1 Jun
11 Jul
2 wk after
3 Jul
6 wk after
Hollyhock
Alcea rosea
26 Mar – 9 Apr
6-8 wk
21 May
0 wk
3 Jun
2 wk after
Alpine delphinium
Delphinium elatum
26 Feb – 26 Mar
19 Apr
8-12 wk
21 May
14 Jun
0 wk
15 Jun
4 wk after
African marigold
Tagetes erecta
15 – 29 Apr
30 May
6-8 wk
10 Jun
11 Jul
3 wk after
Black-eyed Susan
Rudbeckia hirta
1 – 15 Apr
23 May
6-8 wk
27 May
4 Jul
1 wk after
3 Jul
6 wk after
Wood sage
Salvia nemorosa
12 – 26 Mar
9 Apr
8-10 wk
21 May
4 Jun
0 wk
15 Jun
4 wk after
Black-eyed susan vine
Thunbergia alata
15 Apr – 13 May
13 May
6-10 wk
24 Jun
24 Jun
5 wk after
California goldenpoppy
Eschscholzia californica
21 May
14 Jul
0 wk
22 May
4 Jul
0 wk
Painted tongue
Salpiglossis sinuata
1 – 15 Apr
9 May
8-10 wk
10 Jun
4 Jul
3 wk after
Water forget-me-not
Myosotis scorpioides
26 Mar – 9 Apr
3 May
6-8 wk
21 May
14 Jun
0 wk
3 Jun
4 Jun
2 wk after