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