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Rel. frost
Last spring frost (0°C) 5 May Frost 9 of 10 years · 20 years of data
Frost-free season 140 days 5 May – 22 Sep
Probability that frost is over

10% = Half of years are frost-free by this date. More about frost & season →

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

Herbs

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