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Rel. frost
Last spring frost (0°C) 1 May Frost 9 of 10 years · 20 years of data
Frost-free season 150 days 1 May – 28 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)
13 – 27 Mar
16 Jun
5-7 wk
1 May
21 Jul
0 wk
5 May
11 Jul
1 wk after
Broccoli
Brassica oleracea (Italica-gruppen)
20 Mar – 3 Apr
28 Jun
4-6 wk
1 May
26 Jul
0 wk
5 May
16 Jul
1 wk after
Chili pepper
Capsicum annuum
Season too short
19 Feb – 19 Mar
8-12 wk
14 May
2 wk after
Curly Kale
Brassica oleracea (Curly Kale-gruppen)
13 – 27 Mar
11 Jun
5-7 wk
1 May
16 Jul
0 wk
1 May
6 Jul
0 wk
Garden cucumber
Cucumis sativus
Greenhouse
16 – 23 Apr
12 May
3-4 wk
14 May
2 Jun
2 wk after
Florence Fennel
Foeniculum vulgare
2 – 9 May
28 May
4-5 wk
6 Jun
25 Jun
5 wk after
19 Jun
7 wk after
Butter bean
Phaseolus lunatus
Season too short
19 – 26 May
3-4 wk
16 Jun
7 wk after
Onion
Allium cepa (Cepa-gruppen)
6 Feb – 6 Mar
30 Mar
8-12 wk
1 May
25 May
0 wk
22 May
3 wk after
Onion (sets)
Allium cepa (Cepa-gruppen)
5 May
14 Jun
1 wk after
5 May
4 Jun
1 wk after
Maize
Zea mays
Greenhouse
3 – 10 Apr
2 May
3-4 wk
1 May
23 May
0 wk
Swiss Chard
Beta vulgaris (Flavescens-gruppen)
10 – 17 Apr
5 Jul
3-4 wk
8 May
26 Jul
1 wk after
22 May
16 Jul
3 wk after
Carrot
Daucus carota subsp. sativus var. sativus
1 May
6 Jul
0 wk
1 May
26 Jun
0 wk
Palm Kale
Brassica oleracea (Palm Kale-gruppen)
13 – 27 Mar
11 Jun
5-7 wk
1 May
16 Jul
0 wk
1 May
6 Jul
0 wk
Potato
Solanum tuberosum
5 – 19 Apr
27 May
4-6 wk
17 May
24 Jun
2 wk after
17 May
14 Jun
2 wk after
Ornamental Kale
Brassica oleracea (Ornamental-gruppen)
13 – 27 Mar
21 Jun
5-7 wk
1 May
26 Jul
0 wk
5 May
16 Jul
1 wk after
Pumpkin
Cucurbita pepo
Fleece
25 Apr – 2 May
17 May
3-4 wk
23 May
7 Jun
3 wk after
Beetroot
Beta vulgaris (Conditiva-gruppen)
10 – 17 Apr
9 Jun
3-4 wk
8 May
30 Jun
1 wk after
22 May
20 Jun
3 wk after
Red Cabbage
Brassica oleracea (Red Cabbage-gruppen)
20 Mar – 3 Apr
23 Jun
4-6 wk
1 May
21 Jul
0 wk
Lettuce
Lactuca sativa
3 – 10 Apr
10 Jul
3-4 wk
1 May
31 Jul
0 wk
5 May
21 Jul
1 wk after
Savoy Cabbage
Brassica oleracea (Savoy Cabbage-gruppen)
20 Mar – 3 Apr
23 Jun
4-6 wk
1 May
21 Jul
0 wk
Shallot (bulbs)
Allium cepa (Aggregatum-gruppen)
3 – 17 Apr
2 Jun
2-4 wk
1 May
16 Jun
0 wk
1 May
6 Jun
0 wk
Shallot (sets)
Allium cepa (Aggregatum-gruppen)
5 May
14 Jun
1 wk after
5 May
4 Jun
1 wk after
Spinach
Spinacia oleracea
3 – 10 Apr
25 Jul
3-4 wk
1 May
15 Aug
0 wk
27 Apr
5 Aug
1 wk before
Sweet potato
Ipomoea batatas
2 – 16 Jun
4-6 wk
14 Jul
11 wk after
Garden tomato
Solanum lycopersicum
Greenhouse
6 – 20 Mar
11 Apr
6-8 wk
1 May
23 May
0 wk
Tomatillo
Physalis ixocarpa
Common Bean
Phaseolus vulgaris
Fleece
16 – 30 Apr
19 May
2-4 wk
14 May
2 Jun
2 wk after
5 Jun
5 wk after
White Cabbage
Brassica oleracea (White Cabbage-gruppen)
20 Mar – 3 Apr
23 Jun
4-6 wk
1 May
21 Jul
0 wk
Garden pea
Pisum sativum
3 – 10 Apr
25 Jun
3-4 wk
1 May
16 Jul
0 wk
5 May
6 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
11 – 25 Apr
25 Apr
4-6 wk
23 May
23 May
3 wk after
Lemon balm
Melissa officinalis
20 Feb – 6 Mar
21 May
8-10 wk
1 May
16 Jul
0 wk
5 Jun
6 Jul
5 wk after
Dill
Anethum graveolens
5 May
26 Jul
1 wk after
Wild chives
Allium schoenoprasum
6 – 20 Mar
4 Jun
6-8 wk
1 May
16 Jul
0 wk
5 May
6 Jul
1 wk after
Spearmint
Mentha spicata
6 Feb – 6 Mar
21 May
8-12 wk
1 May
16 Jul
0 wk
5 Jun
6 Jul
5 wk after
Coriander
Coriandrum sativum
1 May
15 Aug
0 wk
22 May
5 Aug
3 wk after
Garden sage
Salvia officinalis
27 Feb – 13 Mar
6 May
8-10 wk
8 May
1 Jul
1 wk after
Common thyme
Thymus vulgaris
20 Feb – 6 Mar
11 May
8-10 wk
1 May
6 Jul
0 wk
Oregano
Origanum vulgare
6 – 20 Mar
25 May
6-8 wk
1 May
6 Jul
0 wk
5 Jun
26 Jun
5 wk after
Parsley
Petroselinum crispum
6 – 20 Mar
25 May
6-8 wk
1 May
6 Jul
0 wk
5 May
26 Jun
1 wk after
Rosemary
Salvia rosmarinus
30 Jan – 27 Feb
6 Apr
10-14 wk
8 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
25 Apr – 2 May
2 May
3-4 wk
23 May
23 May
3 wk after
Cornflower
Centaurea cyanus
1 May
16 Jul
0 wk
5 May
6 Jul
1 wk after
Statice
Limonium sinuatum
Fleece
5 – 19 Mar
16 Apr
8-10 wk
14 May
11 Jun
2 wk after
Sweet William
Dianthus barbatus
6 – 20 Mar
6-8 wk
1 May
0 wk
17 May
2 wk after
Snow-on-the-mountain
Euphorbia marginata
Fleece
19 Mar – 2 Apr
30 Apr
6-8 wk
14 May
11 Jun
2 wk after
29 Jun
8 wk after
Pinnate dahlia
Dahlia × pinnata
21 Mar – 4 Apr
11 Apr
6-8 wk
16 May
23 May
2 wk after
Pinnate dahlia (tubers)
Dahlia × pinnata
10 Apr – 8 May
25 Apr
4-8 wk
5 Jun
5 wk after
5 Jun
5 wk after
Foxglove
Digitalis purpurea
20 Feb – 6 Mar
8-10 wk
1 May
0 wk
22 May
3 wk after
Busy lizzie
Impatiens walleriana
14 Mar – 11 Apr
13 May
8-12 wk
6 Jun
8 Jul
5 wk after
Creeping zinnia
Sanvitalia procumbens
28 Mar – 11 Apr
16 Apr
6-8 wk
23 May
28 May
3 wk after
Hyacinth bean
Dolichos lablab
Season too short
11 – 25 Apr
4-6 wk
23 May
3 wk after
Chinese lantern
Physalis alkekengi
27 Feb – 13 Mar
21 Apr
8-10 wk
8 May
16 Jun
1 wk after
Love in a mist
Nigella damascena
1 May
1 Jul
0 wk
5 May
21 Jun
1 wk after
Strawflower
Xerochrysum bracteatum
Fleece
19 Mar – 2 Apr
20 Apr
6-8 wk
14 May
1 Jun
2 wk after
29 Jun
8 wk after
Purple-top vervain
Verbena bonariensis
13 Feb – 13 Mar
21 Apr
8-12 wk
8 May
16 Jun
1 wk after
Cardoon
Cynara cardunculus
28 Feb – 28 Mar
22 Mar
8-12 wk
23 May
3 wk after
Regal-foxtail
Ptilotus nobilis
Greenhouse
19 Feb – 19 Mar
28 Mar
8-12 wk
14 May
23 May
2 wk after
Globe amaranth
Gomphrena globosa
Greenhouse
19 Mar – 2 Apr
11 Apr
6-8 wk
14 May
23 May
2 wk after
Corn poppy
Papaver rhoeas
1 May
16 Jul
0 wk
5 May
6 Jul
1 wk after
Snapdragon
Antirrhinum majus
6 Feb – 6 Mar
11 May
8-12 wk
1 May
6 Jul
0 wk
17 May
26 Jun
2 wk after
Flossflower
Ageratum houstonianum
Fleece
14 – 28 Mar
26 Apr
8-10 wk
23 May
21 Jun
3 wk after
Sweet pea
Lathyrus odoratus
6 – 27 Mar
1 Jun
5-8 wk
1 May
6 Jul
0 wk
Stock
Matthiola incana
6 – 20 Mar
4 Jun
6-8 wk
1 May
16 Jul
0 wk
22 May
6 Jul
3 wk after
Wormwood
Artemisia absinthium
6 – 20 Mar
5 May
6-8 wk
1 May
16 Jun
0 wk
22 May
6 Jun
3 wk after
Mexican sunflower
Tithonia rotundifolia
Greenhouse
2 – 16 Apr
20 Apr
4-6 wk
14 May
18 May
2 wk after
Garden pansy
Viola × wittrockiana
20 Feb – 6 Mar
21 May
8-10 wk
1 May
16 Jul
0 wk
17 May
6 Jul
2 wk after
Petunia
Petunia
Fleece
19 Feb – 19 Mar
16 Apr
8-12 wk
14 May
11 Jun
2 wk after
Sweet Scabious
Scabiosa atropurpurea
13 – 27 Mar
5 May
6-8 wk
8 May
16 Jun
1 wk after
19 Jun
7 wk after
Common zinnia
Zinnia elegans
11 – 25 Apr
25 Apr
4-6 wk
23 May
23 May
3 wk after
Common morning glory
Ipomoea purpurea
Fleece
18 Apr – 2 May
2 May
3-5 wk
23 May
23 May
3 wk after
Garden cosmos
Cosmos bipinnatus
11 – 25 Apr
25 Apr
4-6 wk
23 May
23 May
3 wk after
19 Jun
7 wk after
Scarlet milkweed
Asclepias curassavica
Fleece
14 Mar – 11 Apr
17 Apr
8-12 wk
6 Jun
12 Jun
5 wk after
Bee balm
Monarda didyma
6 Feb – 6 Mar
21 Apr
8-12 wk
1 May
16 Jun
0 wk
5 Jun
6 Jun
5 wk after
Yarrow
Achillea millefolium
6 – 20 Mar
5 Apr
6-8 wk
1 May
17 May
0 wk
22 May
3 wk after
Safflower
Carthamus tinctorius
1 May
16 Jun
0 wk
5 May
6 Jun
1 wk after
Iceland poppy
Papaver nudicaule
Season too short
6 – 20 Mar
25 May
6-8 wk
1 May
6 Jul
0 wk
13 Apr
26 Jun
3 wk before
Bishop's flower
Ammi majus
20 Mar – 3 Apr
8 Jun
4-6 wk
1 May
6 Jul
0 wk
22 May
26 Jun
3 wk after
Drumsticks
Pycnosorus globosus
Greenhouse
19 Feb – 5 Mar
18 Mar
10-12 wk
14 May
27 May
2 wk after
Sunflower
Helianthus annuus
25 Apr – 2 May
14 Jun
3-4 wk
23 May
5 Jul
3 wk after
5 Jun
25 Jun
5 wk after
China aster
Callistephus chinensis
28 Mar – 11 Apr
3 Jun
6-8 wk
23 May
15 Jul
3 wk after
19 Jun
5 Jul
7 wk after
Annual phlox
Phlox drummondii
19 Mar – 2 Apr
16 Apr
6-8 wk
14 May
28 May
2 wk after
19 Jun
7 wk after
Hollyhock
Alcea rosea
6 – 20 Mar
6-8 wk
1 May
0 wk
22 May
3 wk after
Alpine delphinium
Delphinium elatum
6 Feb – 6 Mar
21 Apr
8-12 wk
1 May
16 Jun
0 wk
5 Jun
6 Jun
5 wk after
African marigold
Tagetes erecta
28 Mar – 11 Apr
16 Apr
6-8 wk
23 May
28 May
3 wk after
Black-eyed Susan
Rudbeckia hirta
13 – 27 Mar
24 May
6-8 wk
8 May
5 Jul
1 wk after
19 Jun
25 Jun
7 wk after
Wood sage
Salvia nemorosa
20 Feb – 6 Mar
11 Apr
8-10 wk
1 May
6 Jun
0 wk
5 Jun
5 wk after
Black-eyed susan vine
Thunbergia alata
Fleece
14 Mar – 11 Apr
11 Apr
6-10 wk
23 May
23 May
3 wk after
California goldenpoppy
Eschscholzia californica
1 May
16 Jul
0 wk
5 May
6 Jul
1 wk after
Painted tongue
Salpiglossis sinuata
14 – 28 Mar
30 Apr
8-10 wk
23 May
25 Jun
3 wk after
Water forget-me-not
Myosotis scorpioides
6 – 20 Mar
5 May
6-8 wk
1 May
16 Jun
0 wk
22 May
6 Jun
3 wk after