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Method
Rel. frost
Last spring frost (0°C) 13 May Normal year · 20 years of data
Frost-free season 140 days 13 May – 30 Sep
Probability that frost is over

50% = Half of years are frost-free by this date. More about frost & season →

Custom date

Vegetables

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