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