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Method
Rel. frost
Last spring frost (0°C) 9 May Normal year · 20 years of data
Frost-free season 153 days 9 May – 9 Oct
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)
21 Mar – 4 Apr
15 Jun
5-7 wk
9 May
20 Jul
0 wk
13 May
10 Jul
1 wk after
Broccoli
Brassica oleracea (Italica-gruppen)
28 Mar – 11 Apr
27 Jun
4-6 wk
9 May
25 Jul
0 wk
13 May
15 Jul
1 wk after
Chili pepper
Capsicum annuum
Fleece
13 Mar – 10 Apr
13 Apr
8-12 wk
5 Jun
8 Jun
4 wk after
Curly Kale
Brassica oleracea (Curly Kale-gruppen)
21 Mar – 4 Apr
10 Jun
5-7 wk
9 May
15 Jul
0 wk
9 May
5 Jul
0 wk
Garden cucumber
Cucumis sativus
24 – 31 May
7 Jun
3-4 wk
21 Jun
28 Jun
6 wk after
Florence Fennel
Foeniculum vulgare
17 – 24 May
7 Jun
4-5 wk
21 Jun
5 Jul
6 wk after
27 Jun
7 wk after
Butter bean
Phaseolus lunatus
Greenhouse
29 May – 5 Jun
3-4 wk
26 Jun
7 wk after
Onion
Allium cepa (Cepa-gruppen)
14 Feb – 14 Mar
31 Mar
8-12 wk
9 May
26 May
0 wk
30 May
3 wk after
Onion (sets)
Allium cepa (Cepa-gruppen)
13 May
15 Jun
1 wk after
13 May
5 Jun
1 wk after
Maize
Zea mays
8 – 15 May
28 May
3-4 wk
5 Jun
18 Jun
4 wk after
Swiss Chard
Beta vulgaris (Flavescens-gruppen)
19 – 26 Apr
4 Jul
3-4 wk
17 May
25 Jul
1 wk after
30 May
15 Jul
3 wk after
Carrot
Daucus carota subsp. sativus var. sativus
9 May
5 Jul
0 wk
9 May
25 Jun
0 wk
Palm Kale
Brassica oleracea (Palm Kale-gruppen)
21 Mar – 4 Apr
10 Jun
5-7 wk
9 May
15 Jul
0 wk
9 May
5 Jul
0 wk
Potato
Solanum tuberosum
13 – 27 Apr
1 Jun
4-6 wk
25 May
29 Jun
2 wk after
25 May
19 Jun
2 wk after
Ornamental Kale
Brassica oleracea (Ornamental-gruppen)
21 Mar – 4 Apr
20 Jun
5-7 wk
9 May
25 Jul
0 wk
13 May
15 Jul
1 wk after
Pumpkin
Cucurbita pepo
24 – 31 May
20 Jun
3-4 wk
21 Jun
11 Jul
6 wk after
Beetroot
Beta vulgaris (Conditiva-gruppen)
19 – 26 Apr
15 Jun
3-4 wk
17 May
6 Jul
1 wk after
30 May
26 Jun
3 wk after
Red Cabbage
Brassica oleracea (Red Cabbage-gruppen)
28 Mar – 11 Apr
22 Jun
4-6 wk
9 May
20 Jul
0 wk
Lettuce
Lactuca sativa
11 – 18 Apr
9 Jul
3-4 wk
9 May
30 Jul
0 wk
13 May
20 Jul
1 wk after
Savoy Cabbage
Brassica oleracea (Savoy Cabbage-gruppen)
28 Mar – 11 Apr
22 Jun
4-6 wk
9 May
20 Jul
0 wk
Shallot (bulbs)
Allium cepa (Aggregatum-gruppen)
11 – 25 Apr
1 Jun
2-4 wk
9 May
15 Jun
0 wk
9 May
5 Jun
0 wk
Shallot (sets)
Allium cepa (Aggregatum-gruppen)
13 May
15 Jun
1 wk after
13 May
5 Jun
1 wk after
Spinach
Spinacia oleracea
11 – 18 Apr
24 Jul
3-4 wk
9 May
14 Aug
0 wk
5 May
4 Aug
1 wk before
Sweet potato
Ipomoea batatas
10 – 24 Jun
4-6 wk
22 Jul
11 wk after
Garden tomato
Solanum lycopersicum
10 – 24 Apr
7 May
6-8 wk
5 Jun
18 Jun
4 wk after
Tomatillo
Physalis ixocarpa
Common Bean
Phaseolus vulgaris
8 – 22 May
22 Jun
2-4 wk
5 Jun
6 Jul
4 wk after
27 Jun
7 wk after
White Cabbage
Brassica oleracea (White Cabbage-gruppen)
28 Mar – 11 Apr
22 Jun
4-6 wk
9 May
20 Jul
0 wk
Garden pea
Pisum sativum
11 – 18 Apr
24 Jun
3-4 wk
9 May
15 Jul
0 wk
13 May
5 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
10 – 24 May
29 May
4-6 wk
21 Jun
26 Jun
6 wk after
Lemon balm
Melissa officinalis
28 Feb – 14 Mar
20 May
8-10 wk
9 May
15 Jul
0 wk
13 Jun
5 Jul
5 wk after
Dill
Anethum graveolens
13 May
25 Jul
1 wk after
Wild chives
Allium schoenoprasum
14 – 28 Mar
3 Jun
6-8 wk
9 May
15 Jul
0 wk
13 May
5 Jul
1 wk after
Spearmint
Mentha spicata
14 Feb – 14 Mar
20 May
8-12 wk
9 May
15 Jul
0 wk
13 Jun
5 Jul
5 wk after
Coriander
Coriandrum sativum
9 May
14 Aug
0 wk
30 May
4 Aug
3 wk after
Garden sage
Salvia officinalis
8 – 22 Mar
5 May
8-10 wk
17 May
30 Jun
1 wk after
Common thyme
Thymus vulgaris
28 Feb – 14 Mar
10 May
8-10 wk
9 May
5 Jul
0 wk
Oregano
Origanum vulgare
14 – 28 Mar
24 May
6-8 wk
9 May
5 Jul
0 wk
13 Jun
25 Jun
5 wk after
Parsley
Petroselinum crispum
14 – 28 Mar
24 May
6-8 wk
9 May
5 Jul
0 wk
13 May
25 Jun
1 wk after
Rosemary
Salvia rosmarinus
8 Feb – 8 Mar
6 Apr
10-14 wk
17 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
24 – 31 May
5 Jun
3-4 wk
21 Jun
26 Jun
6 wk after
Cornflower
Centaurea cyanus
9 May
15 Jul
0 wk
13 May
5 Jul
1 wk after
Statice
Limonium sinuatum
27 Mar – 10 Apr
4 May
8-10 wk
5 Jun
29 Jun
4 wk after
Sweet William
Dianthus barbatus
14 – 28 Mar
6-8 wk
9 May
0 wk
25 May
2 wk after
Snow-on-the-mountain
Euphorbia marginata
10 – 24 Apr
18 May
6-8 wk
5 Jun
29 Jun
4 wk after
22 Jul
11 wk after
Pinnate dahlia
Dahlia × pinnata
2 – 16 Apr
22 May
6-8 wk
28 May
3 Jul
3 wk after
Pinnate dahlia (tubers)
Dahlia × pinnata
18 Apr – 16 May
5 Jun
4-8 wk
13 Jun
3 Jul
5 wk after
13 Jun
23 Jun
5 wk after
Foxglove
Digitalis purpurea
28 Feb – 14 Mar
8-10 wk
9 May
0 wk
30 May
3 wk after
Busy lizzie
Impatiens walleriana
29 Mar – 26 Apr
24 Jun
8-12 wk
21 Jun
19 Aug
6 wk after
Creeping zinnia
Sanvitalia procumbens
10 – 24 Apr
28 May
6-8 wk
5 Jun
9 Jul
4 wk after
Hyacinth bean
Dolichos lablab
Greenhouse
24 Apr – 8 May
7 May
4-6 wk
5 Jun
4 wk after
Chinese lantern
Physalis alkekengi
8 – 22 Mar
20 Apr
8-10 wk
17 May
15 Jun
1 wk after
Love in a mist
Nigella damascena
9 May
30 Jun
0 wk
13 May
20 Jun
1 wk after
Strawflower
Xerochrysum bracteatum
10 – 24 Apr
8 May
6-8 wk
5 Jun
19 Jun
4 wk after
22 Jul
11 wk after
Purple-top vervain
Verbena bonariensis
22 Feb – 22 Mar
20 Apr
8-12 wk
17 May
15 Jun
1 wk after
Cardoon
Cynara cardunculus
13 Mar – 10 Apr
21 Mar
8-12 wk
5 Jun
4 wk after
Regal-foxtail
Ptilotus nobilis
29 Mar – 26 Apr
21 Apr
8-12 wk
21 Jun
6 wk after
Globe amaranth
Gomphrena globosa
26 Apr – 10 May
5 May
6-8 wk
21 Jun
6 wk after
Corn poppy
Papaver rhoeas
9 May
15 Jul
0 wk
13 May
5 Jul
1 wk after
Snapdragon
Antirrhinum majus
14 Feb – 14 Mar
10 May
8-12 wk
9 May
5 Jul
0 wk
25 May
25 Jun
2 wk after
Flossflower
Ageratum houstonianum
12 – 26 Apr
14 May
8-10 wk
21 Jun
9 Jul
6 wk after
Sweet pea
Lathyrus odoratus
14 Mar – 4 Apr
31 May
5-8 wk
9 May
5 Jul
0 wk
Stock
Matthiola incana
14 – 28 Mar
3 Jun
6-8 wk
9 May
15 Jul
0 wk
30 May
5 Jul
3 wk after
Wormwood
Artemisia absinthium
14 – 28 Mar
4 May
6-8 wk
9 May
15 Jun
0 wk
30 May
5 Jun
3 wk after
Mexican sunflower
Tithonia rotundifolia
10 – 24 May
14 May
4-6 wk
21 Jun
6 wk after
Garden pansy
Viola × wittrockiana
28 Feb – 14 Mar
20 May
8-10 wk
9 May
15 Jul
0 wk
25 May
5 Jul
2 wk after
Petunia
Petunia
13 Mar – 10 Apr
4 May
8-12 wk
5 Jun
29 Jun
4 wk after
Sweet Scabious
Scabiosa atropurpurea
22 Mar – 5 Apr
4 May
6-8 wk
17 May
15 Jun
1 wk after
27 Jun
7 wk after
Common zinnia
Zinnia elegans
24 Apr – 8 May
6 Jun
4-6 wk
5 Jun
4 Jul
4 wk after
Common morning glory
Ipomoea purpurea
17 – 31 May
5 Jun
3-5 wk
21 Jun
26 Jun
6 wk after
Garden cosmos
Cosmos bipinnatus
24 Apr – 8 May
5 Jun
4-6 wk
5 Jun
3 Jul
4 wk after
27 Jun
7 wk after
Scarlet milkweed
Asclepias curassavica
8 Apr – 6 May
21 May
8-12 wk
1 Jul
16 Jul
8 wk after
Bee balm
Monarda didyma
14 Feb – 14 Mar
20 Apr
8-12 wk
9 May
15 Jun
0 wk
13 Jun
5 wk after
Yarrow
Achillea millefolium
14 – 28 Mar
4 Apr
6-8 wk
9 May
16 May
0 wk
30 May
3 wk after
Safflower
Carthamus tinctorius
9 May
15 Jun
0 wk
13 May
5 Jun
1 wk after
Iceland poppy
Papaver nudicaule
Season too short
14 – 28 Mar
24 May
6-8 wk
9 May
5 Jul
0 wk
21 Apr
25 Jun
3 wk before
Bishop's flower
Ammi majus
28 Mar – 11 Apr
7 Jun
4-6 wk
9 May
5 Jul
0 wk
30 May
25 Jun
3 wk after
Drumsticks
Pycnosorus globosus
29 Mar – 12 Apr
10-12 wk
21 Jun
6 wk after
Sunflower
Helianthus annuus
8 – 15 May
14 Jun
3-4 wk
5 Jun
5 Jul
4 wk after
13 Jun
25 Jun
5 wk after
China aster
Callistephus chinensis
10 – 24 Apr
3 Jun
6-8 wk
5 Jun
15 Jul
4 wk after
27 Jun
5 Jul
7 wk after
Annual phlox
Phlox drummondii
29 Mar – 12 Apr
28 May
6-8 wk
24 May
9 Jul
2 wk after
27 Jun
29 Jun
7 wk after
Hollyhock
Alcea rosea
14 – 28 Mar
6-8 wk
9 May
0 wk
30 May
3 wk after
Alpine delphinium
Delphinium elatum
14 Feb – 14 Mar
20 Apr
8-12 wk
9 May
15 Jun
0 wk
13 Jun
5 wk after
African marigold
Tagetes erecta
10 – 24 Apr
28 May
6-8 wk
5 Jun
9 Jul
4 wk after
Black-eyed Susan
Rudbeckia hirta
22 Mar – 5 Apr
24 May
6-8 wk
17 May
5 Jul
1 wk after
27 Jun
7 wk after
Wood sage
Salvia nemorosa
28 Feb – 14 Mar
10 Apr
8-10 wk
9 May
5 Jun
0 wk
13 Jun
5 wk after
Black-eyed susan vine
Thunbergia alata
12 Apr – 10 May
15 May
6-10 wk
21 Jun
26 Jun
6 wk after
California goldenpoppy
Eschscholzia californica
9 May
15 Jul
0 wk
13 May
5 Jul
1 wk after
Painted tongue
Salpiglossis sinuata
27 Mar – 10 Apr
10 May
8-10 wk
5 Jun
5 Jul
4 wk after
Water forget-me-not
Myosotis scorpioides
14 – 28 Mar
4 May
6-8 wk
9 May
15 Jun
0 wk
30 May
5 Jun
3 wk after