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Rel. frost
Last spring frost (0°C) 4 May Frost 9 of 10 years · 20 years of data
Frost-free season 144 days 4 May – 25 Sep
Probability that frost is over

10% = 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)
16 – 30 Mar
12 Jun
5-7 wk
4 May
17 Jul
0 wk
5 May
7 Jul
0 wk
Broccoli
Brassica oleracea (Italica-gruppen)
23 Mar – 6 Apr
24 Jun
4-6 wk
4 May
22 Jul
0 wk
5 May
12 Jul
0 wk
Chili pepper
Capsicum annuum
Season too short
22 Feb – 22 Mar
8-12 wk
17 May
2 wk after
Curly Kale
Brassica oleracea (Curly Kale-gruppen)
16 – 30 Mar
7 Jun
5-7 wk
4 May
12 Jul
0 wk
4 May
2 Jul
0 wk
Garden cucumber
Cucumis sativus
Season too short
19 – 26 Apr
23 Apr
3-4 wk
17 May
2 wk after
Florence Fennel
Foeniculum vulgare
5 – 12 May
25 May
4-5 wk
9 Jun
22 Jun
5 wk after
16 Jun
6 wk after
Butter bean
Phaseolus lunatus
Season too short
22 – 29 May
3-4 wk
19 Jun
7 wk after
Onion
Allium cepa (Cepa-gruppen)
9 Feb – 9 Mar
19 Mar
8-12 wk
4 May
14 May
0 wk
17 May
2 wk after
Onion (sets)
Allium cepa (Cepa-gruppen)
5 May
3 Jun
0 wk
5 May
24 May
0 wk
Maize
Zea mays
Greenhouse
6 – 13 Apr
13 Apr
3-4 wk
4 May
4 May
0 wk
Swiss Chard
Beta vulgaris (Flavescens-gruppen)
13 – 20 Apr
1 Jul
3-4 wk
11 May
22 Jul
1 wk after
17 May
12 Jul
2 wk after
Carrot
Daucus carota subsp. sativus var. sativus
4 May
2 Jul
0 wk
4 May
22 Jun
0 wk
Palm Kale
Brassica oleracea (Palm Kale-gruppen)
16 – 30 Mar
7 Jun
5-7 wk
4 May
12 Jul
0 wk
4 May
2 Jul
0 wk
Potato
Solanum tuberosum
2 – 16 Apr
17 May
4-6 wk
14 May
14 Jun
1 wk after
14 May
4 Jun
1 wk after
Ornamental Kale
Brassica oleracea (Ornamental-gruppen)
16 – 30 Mar
17 Jun
5-7 wk
4 May
22 Jul
0 wk
5 May
12 Jul
0 wk
Pumpkin
Cucurbita pepo
Greenhouse
19 – 26 Apr
18 May
3-4 wk
17 May
8 Jun
2 wk after
Beetroot
Beta vulgaris (Conditiva-gruppen)
13 – 20 Apr
23 May
3-4 wk
11 May
13 Jun
1 wk after
17 May
3 Jun
2 wk after
Red Cabbage
Brassica oleracea (Red Cabbage-gruppen)
23 Mar – 6 Apr
19 Jun
4-6 wk
4 May
17 Jul
0 wk
Lettuce
Lactuca sativa
6 – 13 Apr
6 Jul
3-4 wk
4 May
27 Jul
0 wk
5 May
17 Jul
0 wk
Savoy Cabbage
Brassica oleracea (Savoy Cabbage-gruppen)
23 Mar – 6 Apr
19 Jun
4-6 wk
4 May
17 Jul
0 wk
Shallot (bulbs)
Allium cepa (Aggregatum-gruppen)
6 – 20 Apr
24 May
2-4 wk
4 May
7 Jun
0 wk
4 May
28 May
0 wk
Shallot (sets)
Allium cepa (Aggregatum-gruppen)
5 May
3 Jun
0 wk
5 May
24 May
0 wk
Spinach
Spinacia oleracea
6 – 13 Apr
21 Jul
3-4 wk
4 May
11 Aug
0 wk
1 May
1 Aug
0 wk
Sweet potato
Ipomoea batatas
29 May – 12 Jun
4-6 wk
10 Jul
10 wk after
Garden tomato
Solanum lycopersicum
Greenhouse
9 – 23 Mar
23 Mar
6-8 wk
4 May
4 May
0 wk
Tomatillo
Physalis ixocarpa
Common Bean
Phaseolus vulgaris
Greenhouse
6 – 20 Apr
20 May
2-4 wk
4 May
3 Jun
0 wk
17 May
24 May
2 wk after
White Cabbage
Brassica oleracea (White Cabbage-gruppen)
23 Mar – 6 Apr
19 Jun
4-6 wk
4 May
17 Jul
0 wk
Garden pea
Pisum sativum
6 – 13 Apr
21 Jun
3-4 wk
4 May
12 Jul
0 wk
5 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
Greenhouse
5 – 19 Apr
26 Apr
4-6 wk
17 May
24 May
2 wk after
Lemon balm
Melissa officinalis
23 Feb – 9 Mar
17 May
8-10 wk
4 May
12 Jul
0 wk
29 May
2 Jul
4 wk after
Dill
Anethum graveolens
5 May
22 Jul
0 wk
Wild chives
Allium schoenoprasum
9 – 23 Mar
31 May
6-8 wk
4 May
12 Jul
0 wk
5 May
2 Jul
0 wk
Spearmint
Mentha spicata
9 Feb – 9 Mar
17 May
8-12 wk
4 May
12 Jul
0 wk
29 May
2 Jul
4 wk after
Coriander
Coriandrum sativum
4 May
11 Aug
0 wk
17 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
23 Feb – 9 Mar
7 May
8-10 wk
4 May
2 Jul
0 wk
Oregano
Origanum vulgare
9 – 23 Mar
21 May
6-8 wk
4 May
2 Jul
0 wk
29 May
22 Jun
4 wk after
Parsley
Petroselinum crispum
9 – 23 Mar
21 May
6-8 wk
4 May
2 Jul
0 wk
5 May
22 Jun
0 wk
Rosemary
Salvia rosmarinus
2 Feb – 2 Mar
27 Mar
10-14 wk
11 May
5 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
Greenhouse
19 – 26 Apr
3 May
3-4 wk
17 May
24 May
2 wk after
Cornflower
Centaurea cyanus
4 May
12 Jul
0 wk
5 May
2 Jul
0 wk
Statice
Limonium sinuatum
Fleece
8 – 22 Mar
29 Mar
8-10 wk
17 May
24 May
2 wk after
Sweet William
Dianthus barbatus
9 – 23 Mar
6-8 wk
4 May
0 wk
14 May
1 wk after
Snow-on-the-mountain
Euphorbia marginata
Fleece
22 Mar – 5 Apr
12 Apr
6-8 wk
17 May
24 May
2 wk after
23 Jun
7 wk after
Pinnate dahlia
Dahlia × pinnata
Fleece
16 – 30 Mar
13 Apr
6-8 wk
11 May
25 May
1 wk after
Pinnate dahlia (tubers)
Dahlia × pinnata
3 Apr – 1 May
16 Apr
4-8 wk
29 May
4 wk after
29 May
4 wk after
Foxglove
Digitalis purpurea
23 Feb – 9 Mar
8-10 wk
4 May
0 wk
17 May
2 wk after
Busy lizzie
Impatiens walleriana
17 Mar – 14 Apr
24 Apr
8-12 wk
9 Jun
19 Jun
5 wk after
Creeping zinnia
Sanvitalia procumbens
Fleece
22 Mar – 5 Apr
22 Apr
6-8 wk
17 May
3 Jun
2 wk after
Hyacinth bean
Dolichos lablab
Season too short
14 – 28 Apr
4-6 wk
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
4 May
27 Jun
0 wk
5 May
17 Jun
0 wk
Strawflower
Xerochrysum bracteatum
Greenhouse
9 – 23 Mar
12 Apr
6-8 wk
4 May
24 May
0 wk
5 Jun
5 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
22 Feb – 22 Mar
18 Mar
8-12 wk
17 May
2 wk after
Regal-foxtail
Ptilotus nobilis
Season too short
22 Feb – 22 Mar
19 Mar
8-12 wk
17 May
2 wk after
Globe amaranth
Gomphrena globosa
Season too short
22 Mar – 5 Apr
2 Apr
6-8 wk
17 May
2 wk after
Corn poppy
Papaver rhoeas
4 May
12 Jul
0 wk
5 May
2 Jul
0 wk
Snapdragon
Antirrhinum majus
9 Feb – 9 Mar
7 May
8-12 wk
4 May
2 Jul
0 wk
14 May
22 Jun
1 wk after
Flossflower
Ageratum houstonianum
Fleece
17 – 31 Mar
8 Apr
8-10 wk
26 May
3 Jun
3 wk after
Sweet pea
Lathyrus odoratus
9 – 30 Mar
28 May
5-8 wk
4 May
2 Jul
0 wk
Stock
Matthiola incana
9 – 23 Mar
31 May
6-8 wk
4 May
12 Jul
0 wk
17 May
2 Jul
2 wk after
Wormwood
Artemisia absinthium
9 – 23 Mar
1 May
6-8 wk
4 May
12 Jun
0 wk
17 May
2 Jun
2 wk after
Mexican sunflower
Tithonia rotundifolia
Season too short
5 – 19 Apr
11 Apr
4-6 wk
17 May
2 wk after
Garden pansy
Viola × wittrockiana
23 Feb – 9 Mar
17 May
8-10 wk
4 May
12 Jul
0 wk
14 May
2 Jul
1 wk after
Petunia
Petunia
Fleece
22 Feb – 22 Mar
29 Mar
8-12 wk
17 May
24 May
2 wk after
Sweet Scabious
Scabiosa atropurpurea
16 – 30 Mar
1 May
6-8 wk
11 May
12 Jun
1 wk after
16 Jun
6 wk after
Common zinnia
Zinnia elegans
Fleece
5 – 19 Apr
26 Apr
4-6 wk
17 May
24 May
2 wk after
Common morning glory
Ipomoea purpurea
Greenhouse
12 – 26 Apr
3 May
3-5 wk
17 May
24 May
2 wk after
Garden cosmos
Cosmos bipinnatus
Fleece
5 – 19 Apr
27 Apr
4-6 wk
17 May
25 May
2 wk after
29 May
4 wk after
Scarlet milkweed
Asclepias curassavica
Greenhouse
3 – 31 Mar
18 Apr
8-12 wk
26 May
13 Jun
3 wk after
Bee balm
Monarda didyma
9 Feb – 9 Mar
17 Apr
8-12 wk
4 May
12 Jun
0 wk
29 May
2 Jun
4 wk after
Yarrow
Achillea millefolium
9 – 23 Mar
1 Apr
6-8 wk
4 May
13 May
0 wk
17 May
2 wk after
Safflower
Carthamus tinctorius
4 May
12 Jun
0 wk
5 May
2 Jun
0 wk
Iceland poppy
Papaver nudicaule
Season too short
9 – 23 Mar
21 May
6-8 wk
4 May
2 Jul
0 wk
18 Apr
22 Jun
2 wk before
Bishop's flower
Ammi majus
23 Mar – 6 Apr
4 Jun
4-6 wk
4 May
2 Jul
0 wk
17 May
22 Jun
2 wk after
Drumsticks
Pycnosorus globosus
Season too short
22 Feb – 8 Mar
24 Feb
10-12 wk
17 May
2 wk after
Sunflower
Helianthus annuus
28 Apr – 5 May
4 Jun
3-4 wk
26 May
25 Jun
3 wk after
29 May
15 Jun
4 wk after
China aster
Callistephus chinensis
31 Mar – 14 Apr
24 May
6-8 wk
26 May
5 Jul
3 wk after
16 Jun
25 Jun
6 wk after
Annual phlox
Phlox drummondii
22 Mar – 5 Apr
11 Apr
6-8 wk
17 May
23 May
2 wk after
16 Jun
6 wk after
Hollyhock
Alcea rosea
9 – 23 Mar
6-8 wk
4 May
0 wk
17 May
2 wk after
Alpine delphinium
Delphinium elatum
9 Feb – 9 Mar
17 Apr
8-12 wk
4 May
12 Jun
0 wk
29 May
2 Jun
4 wk after
African marigold
Tagetes erecta
Fleece
22 Mar – 5 Apr
22 Apr
6-8 wk
17 May
3 Jun
2 wk after
Black-eyed Susan
Rudbeckia hirta
16 – 30 Mar
14 May
6-8 wk
11 May
25 Jun
1 wk after
16 Jun
6 wk after
Wood sage
Salvia nemorosa
23 Feb – 9 Mar
7 Apr
8-10 wk
4 May
2 Jun
0 wk
29 May
4 wk after
Black-eyed susan vine
Thunbergia alata
Greenhouse
8 Mar – 5 Apr
12 Apr
6-10 wk
17 May
24 May
2 wk after
California goldenpoppy
Eschscholzia californica
4 May
12 Jul
0 wk
5 May
2 Jul
0 wk
Painted tongue
Salpiglossis sinuata
17 – 31 Mar
27 Apr
8-10 wk
26 May
22 Jun
3 wk after
Water forget-me-not
Myosotis scorpioides
9 – 23 Mar
1 May
6-8 wk
4 May
12 Jun
0 wk
17 May
2 Jun
2 wk after