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Rel. frost
Last spring frost (0°C) 2 May Frost 9 of 10 years · 20 years of data
Frost-free season 144 days 2 May – 23 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)
15 – 29 Apr
21 Jun
5-7 wk
3 Jun
26 Jul
5 wk after
26 Apr
16 Jul
1 wk before
Broccoli
Brassica oleracea (Italica-gruppen)
10 – 24 Apr
3 Jul
4-6 wk
22 May
31 Jul
3 wk after
26 Apr
21 Jul
1 wk before
Chili pepper
Capsicum annuum
Season too short
20 Mar – 17 Apr
8-12 wk
12 Jun
6 wk after
Curly Kale
Brassica oleracea (Curly Kale-gruppen)
12 – 26 Feb
16 Jun
5-7 wk
2 Apr
21 Jul
4 wk before
19 Apr
11 Jul
2 wk before
Garden cucumber
Cucumis sativus
Season too short
15 – 22 May
3-4 wk
12 Jun
6 wk after
Florence Fennel
Foeniculum vulgare
3 – 10 Jun
4-5 wk
8 Jul
10 wk after
12 Jun
18 Jun
6 wk after
Butter bean
Phaseolus lunatus
Season too short
14 – 21 Jun
3-4 wk
12 Jul
10 wk after
Onion
Allium cepa (Cepa-gruppen)
7 Feb – 7 Mar
2 Apr
8-12 wk
2 May
28 May
Vid frost
15 May
18 May
2 wk after
Onion (sets)
Allium cepa (Cepa-gruppen)
26 Apr
17 Jun
1 wk before
26 Apr
7 Jun
1 wk before
Maize
Zea mays
Season too short
30 Apr – 7 May
3-4 wk
28 May
4 wk after
Swiss Chard
Beta vulgaris (Flavescens-gruppen)
6 – 13 May
7 Jul
3-4 wk
3 Jun
28 Jul
5 wk after
15 May
18 Jul
2 wk after
Carrot
Daucus carota subsp. sativus var. sativus
19 Apr
1 Jul
2 wk before
Palm Kale
Brassica oleracea (Palm Kale-gruppen)
12 – 26 Feb
16 Jun
5-7 wk
2 Apr
21 Jul
4 wk before
19 Apr
11 Jul
2 wk before
Potato
Solanum tuberosum
26 Mar – 9 Apr
31 May
4-6 wk
7 May
28 Jun
1 wk after
7 May
18 Jun
1 wk after
Ornamental Kale
Brassica oleracea (Ornamental-gruppen)
12 – 26 Feb
26 Jun
5-7 wk
2 Apr
31 Jul
4 wk before
26 Apr
21 Jul
1 wk before
Pumpkin
Cucurbita pepo
Greenhouse
15 – 22 May
29 May
3-4 wk
12 Jun
19 Jun
6 wk after
Beetroot
Beta vulgaris (Conditiva-gruppen)
6 – 13 May
12 Jun
3-4 wk
3 Jun
3 Jul
5 wk after
15 May
23 Jun
2 wk after
Red Cabbage
Brassica oleracea (Red Cabbage-gruppen)
10 – 24 Apr
28 Jun
4-6 wk
22 May
26 Jul
3 wk after
Lettuce
Lactuca sativa
26 Mar – 2 Apr
15 Jul
3-4 wk
23 Apr
5 Aug
1 wk before
26 Apr
26 Jul
1 wk before
Savoy Cabbage
Brassica oleracea (Savoy Cabbage-gruppen)
12 – 26 Mar
28 Jun
4-6 wk
23 Apr
26 Jul
1 wk before
Shallot (bulbs)
Allium cepa (Aggregatum-gruppen)
22 Mar – 5 Apr
7 Jun
2-4 wk
19 Apr
21 Jun
2 wk before
19 Apr
11 Jun
2 wk before
Shallot (sets)
Allium cepa (Aggregatum-gruppen)
26 Apr
17 Jun
1 wk before
26 Apr
7 Jun
1 wk before
Spinach
Spinacia oleracea
15 – 22 Mar
30 Jul
3-4 wk
12 Apr
20 Aug
3 wk before
12 Apr
10 Aug
3 wk before
Sweet potato
Ipomoea batatas
3 – 17 Jun
4-6 wk
15 Jul
11 wk after
Garden tomato
Solanum lycopersicum
Season too short
2 – 16 Apr
6-8 wk
28 May
4 wk after
Tomatillo
Physalis ixocarpa
Common Bean
Phaseolus vulgaris
Greenhouse
30 Apr – 14 May
31 May
2-4 wk
28 May
14 Jun
4 wk after
15 May
4 Jun
2 wk after
White Cabbage
Brassica oleracea (White Cabbage-gruppen)
10 – 24 Apr
28 Jun
4-6 wk
22 May
26 Jul
3 wk after
Garden pea
Pisum sativum
15 – 22 Mar
30 Jun
3-4 wk
12 Apr
21 Jul
3 wk before
26 Apr
11 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
1 – 15 May
7 May
4-6 wk
12 Jun
6 wk after
Lemon balm
Melissa officinalis
21 Feb – 7 Mar
26 May
8-10 wk
2 May
21 Jul
Vid frost
28 May
11 Jul
4 wk after
Dill
Anethum graveolens
26 Apr
28 Jul
1 wk before
Wild chives
Allium schoenoprasum
5 – 19 Feb
9 Jun
6-8 wk
2 Apr
21 Jul
4 wk before
26 Apr
11 Jul
1 wk before
Spearmint
Mentha spicata
18 Jan – 15 Feb
26 May
8-12 wk
12 Apr
21 Jul
3 wk before
28 May
11 Jul
4 wk after
Coriander
Coriandrum sativum
15 May
7 Aug
2 wk after
Garden sage
Salvia officinalis
25 Mar – 8 Apr
11 May
8-10 wk
3 Jun
6 Jul
5 wk after
Common thyme
Thymus vulgaris
13 – 27 Mar
16 May
8-10 wk
22 May
11 Jul
3 wk after
Oregano
Origanum vulgare
16 – 30 Mar
30 May
6-8 wk
11 May
11 Jul
1 wk after
28 May
1 Jul
4 wk after
Parsley
Petroselinum crispum
15 Feb – 1 Mar
30 May
6-8 wk
12 Apr
11 Jul
3 wk before
26 Apr
1 Jul
1 wk before
Rosemary
Salvia rosmarinus
25 Feb – 25 Mar
3 Apr
10-14 wk
3 Jun
12 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
15 – 22 May
3-4 wk
12 Jun
6 wk after
Cornflower
Centaurea cyanus
12 Apr
21 Jul
3 wk before
26 Apr
11 Jul
1 wk before
Statice
Limonium sinuatum
Fleece
3 – 17 Apr
8-10 wk
12 Jun
6 wk after
Sweet William
Dianthus barbatus
15 Feb – 1 Mar
6-8 wk
12 Apr
3 wk before
7 May
1 wk after
Snow-on-the-mountain
Euphorbia marginata
Fleece
17 Apr – 1 May
6-8 wk
12 Jun
6 wk after
17 Jun
7 wk after
Pinnate dahlia
Dahlia × pinnata
Fleece
8 – 22 Apr
1 May
6-8 wk
3 Jun
12 Jun
5 wk after
Pinnate dahlia (tubers)
Dahlia × pinnata
2 – 30 Apr
27 Apr
4-8 wk
28 May
4 wk after
28 May
4 wk after
Foxglove
Digitalis purpurea
1 – 15 Feb
8-10 wk
12 Apr
3 wk before
15 May
2 wk after
Busy lizzie
Impatiens walleriana
Fleece
4 Apr – 2 May
25 May
8-12 wk
27 Jun
20 Jul
8 wk after
Creeping zinnia
Sanvitalia procumbens
Fleece
17 Apr – 1 May
25 Apr
6-8 wk
12 Jun
6 wk after
Hyacinth bean
Dolichos lablab
Season too short
16 – 30 May
4-6 wk
27 Jun
8 wk after
Chinese lantern
Physalis alkekengi
25 Mar – 8 Apr
23 Apr
8-10 wk
3 Jun
18 Jun
5 wk after
Love in a mist
Nigella damascena
26 Apr
26 Jun
1 wk before
Strawflower
Xerochrysum bracteatum
Greenhouse
2 – 16 Apr
22 Apr
6-8 wk
28 May
3 Jun
4 wk after
4 Jun
5 wk after
Purple-top vervain
Verbena bonariensis
11 Mar – 8 Apr
23 Apr
8-12 wk
3 Jun
18 Jun
5 wk after
Cardoon
Cynara cardunculus
Fleece
20 Mar – 17 Apr
27 Mar
8-12 wk
12 Jun
6 wk after
Regal-foxtail
Ptilotus nobilis
Greenhouse
20 Mar – 17 Apr
30 Mar
8-12 wk
12 Jun
6 wk after
Globe amaranth
Gomphrena globosa
Greenhouse
17 Apr – 1 May
6-8 wk
12 Jun
6 wk after
Corn poppy
Papaver rhoeas
26 Apr
11 Jul
1 wk before
Snapdragon
Antirrhinum majus
29 Jan – 26 Feb
16 May
8-12 wk
23 Apr
11 Jul
1 wk before
7 May
1 Jul
1 wk after
Flossflower
Ageratum houstonianum
Fleece
18 Apr – 2 May
8-10 wk
27 Jun
8 wk after
Sweet pea
Lathyrus odoratus
15 Feb – 8 Mar
6 Jun
5-8 wk
12 Apr
11 Jul
3 wk before
Stock
Matthiola incana
26 Feb – 12 Mar
9 Jun
6-8 wk
23 Apr
21 Jul
1 wk before
15 May
11 Jul
2 wk after
Wormwood
Artemisia absinthium
15 Feb – 1 Mar
10 May
6-8 wk
12 Apr
21 Jun
3 wk before
15 May
11 Jun
2 wk after
Mexican sunflower
Tithonia rotundifolia
Greenhouse
1 – 15 May
4-6 wk
12 Jun
6 wk after
Garden pansy
Viola × wittrockiana
22 Jan – 5 Feb
26 May
8-10 wk
2 Apr
21 Jul
4 wk before
7 May
11 Jul
1 wk after
Petunia
Petunia
Fleece
20 Mar – 17 Apr
1 Apr
8-12 wk
12 Jun
6 wk after
Sweet Scabious
Scabiosa atropurpurea
8 – 22 Apr
7 May
6-8 wk
3 Jun
18 Jun
5 wk after
12 Jun
6 wk after
Common zinnia
Zinnia elegans
Fleece
1 – 15 May
7 May
4-6 wk
12 Jun
6 wk after
Common morning glory
Ipomoea purpurea
Greenhouse
8 – 22 May
14 May
3-5 wk
12 Jun
6 wk after
Garden cosmos
Cosmos bipinnatus
Fleece
1 – 15 May
15 May
4-6 wk
12 Jun
12 Jun
6 wk after
28 May
2 Jun
4 wk after
Scarlet milkweed
Asclepias curassavica
Greenhouse
4 Apr – 2 May
29 Apr
8-12 wk
27 Jun
8 wk after
Bee balm
Monarda didyma
7 Feb – 7 Mar
26 Apr
8-12 wk
2 May
21 Jun
Vid frost
28 May
11 Jun
4 wk after
Yarrow
Achillea millefolium
15 Feb – 1 Mar
10 Apr
6-8 wk
12 Apr
22 May
3 wk before
15 May
2 wk after
Safflower
Carthamus tinctorius
12 Apr
21 Jun
3 wk before
26 Apr
11 Jun
1 wk before
Iceland poppy
Papaver nudicaule
5 – 19 Feb
30 May
6-8 wk
2 Apr
11 Jul
4 wk before
19 Apr
1 Jul
2 wk before
Bishop's flower
Ammi majus
5 – 19 Apr
13 Jun
4-6 wk
17 May
11 Jul
2 wk after
15 May
1 Jul
2 wk after
Drumsticks
Pycnosorus globosus
Greenhouse
20 Mar – 3 Apr
10-12 wk
12 Jun
6 wk after
Sunflower
Helianthus annuus
30 May – 6 Jun
11 Jun
3-4 wk
27 Jun
2 Jul
8 wk after
28 May
22 Jun
4 wk after
China aster
Callistephus chinensis
2 – 16 May
31 May
6-8 wk
27 Jun
12 Jul
8 wk after
12 Jun
2 Jul
6 wk after
Annual phlox
Phlox drummondii
Fleece
2 – 16 Apr
25 Apr
6-8 wk
28 May
6 Jun
4 wk after
28 May
4 wk after
Hollyhock
Alcea rosea
15 Feb – 1 Mar
6-8 wk
12 Apr
3 wk before
15 May
2 wk after
Alpine delphinium
Delphinium elatum
27 Feb – 27 Mar
26 Apr
8-12 wk
22 May
21 Jun
3 wk after
28 May
11 Jun
4 wk after
African marigold
Tagetes erecta
Fleece
17 Apr – 1 May
25 Apr
6-8 wk
12 Jun
6 wk after
Black-eyed Susan
Rudbeckia hirta
8 – 22 Apr
21 May
6-8 wk
3 Jun
2 Jul
5 wk after
12 Jun
22 Jun
6 wk after
Wood sage
Salvia nemorosa
2 – 16 Mar
16 Apr
8-10 wk
11 May
11 Jun
1 wk after
28 May
1 Jun
4 wk after
Black-eyed susan vine
Thunbergia alata
Greenhouse
3 Apr – 1 May
23 Apr
6-10 wk
12 Jun
6 wk after
California goldenpoppy
Eschscholzia californica
26 Apr
11 Jul
1 wk before
Painted tongue
Salpiglossis sinuata
18 Apr – 2 May
3 May
8-10 wk
27 Jun
28 Jun
8 wk after
Water forget-me-not
Myosotis scorpioides
15 Feb – 1 Mar
10 May
6-8 wk
12 Apr
21 Jun
3 wk before
15 May
11 Jun
2 wk after