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Method
Rel. frost
Last spring frost (0°C) 5 May Frost 3 of 4 years · 20 years of data
Frost-free season 144 days 5 May – 26 Sep
Probability that frost is over

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