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Method
Rel. frost
Last spring frost (0°C) 28 May Frost 1 of 10 years · 20 years of data
Frost-free season 143 days 28 May – 18 Oct
Probability that frost is over

90% = 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)
9 – 23 Apr
16 Jun
5-7 wk
28 May
21 Jul
0 wk
1 Jun
11 Jul
1 wk after
Broccoli
Brassica oleracea (Italica-gruppen)
16 – 30 Apr
28 Jun
4-6 wk
28 May
26 Jul
0 wk
1 Jun
16 Jul
1 wk after
Chili pepper
Capsicum annuum
Season too short
11 Mar – 8 Apr
8-12 wk
3 Jun
1 wk after
Curly Kale
Brassica oleracea (Curly Kale-gruppen)
9 – 23 Apr
11 Jun
5-7 wk
28 May
16 Jul
0 wk
28 May
6 Jul
0 wk
Garden cucumber
Cucumis sativus
Greenhouse
6 – 13 May
22 May
3-4 wk
3 Jun
12 Jun
1 wk after
Florence Fennel
Foeniculum vulgare
25 May – 1 Jun
8 Jun
4-5 wk
29 Jun
6 Jul
5 wk after
16 Jul
7 wk after
Butter bean
Phaseolus lunatus
Season too short
8 – 15 Jun
3-4 wk
6 Jul
6 wk after
Onion
Allium cepa (Cepa-gruppen)
5 Mar – 2 Apr
1 Apr
8-12 wk
28 May
0 wk
18 Jun
3 wk after
Onion (sets)
Allium cepa (Cepa-gruppen)
1 Jun
16 Jun
1 wk after
1 Jun
6 Jun
1 wk after
Maize
Zea mays
Greenhouse
30 Apr – 7 May
12 May
3-4 wk
28 May
2 Jun
0 wk
Swiss Chard
Beta vulgaris (Flavescens-gruppen)
2 – 9 May
5 Jul
3-4 wk
30 May
26 Jul
0 wk
18 Jun
16 Jul
3 wk after
Carrot
Daucus carota subsp. sativus var. sativus
28 May
6 Jul
0 wk
28 May
26 Jun
0 wk
Palm Kale
Brassica oleracea (Palm Kale-gruppen)
9 – 23 Apr
11 Jun
5-7 wk
28 May
16 Jul
0 wk
28 May
6 Jul
0 wk
Potato
Solanum tuberosum
2 – 16 May
8 Jun
4-6 wk
13 Jun
6 Jul
2 wk after
13 Jun
26 Jun
2 wk after
Ornamental Kale
Brassica oleracea (Ornamental-gruppen)
9 – 23 Apr
21 Jun
5-7 wk
28 May
26 Jul
0 wk
1 Jun
16 Jul
1 wk after
Pumpkin
Cucurbita pepo
Fleece
13 – 20 May
27 May
3-4 wk
10 Jun
17 Jun
2 wk after
Beetroot
Beta vulgaris (Conditiva-gruppen)
2 – 9 May
26 Jun
3-4 wk
30 May
17 Jul
0 wk
18 Jun
7 Jul
3 wk after
Red Cabbage
Brassica oleracea (Red Cabbage-gruppen)
16 – 30 Apr
23 Jun
4-6 wk
28 May
21 Jul
0 wk
Lettuce
Lactuca sativa
30 Apr – 7 May
10 Jul
3-4 wk
28 May
31 Jul
0 wk
1 Jun
21 Jul
1 wk after
Savoy Cabbage
Brassica oleracea (Savoy Cabbage-gruppen)
16 – 30 Apr
23 Jun
4-6 wk
28 May
21 Jul
0 wk
Shallot (bulbs)
Allium cepa (Aggregatum-gruppen)
30 Apr – 14 May
2 Jun
2-4 wk
28 May
16 Jun
0 wk
28 May
6 Jun
0 wk
Shallot (sets)
Allium cepa (Aggregatum-gruppen)
1 Jun
16 Jun
1 wk after
1 Jun
6 Jun
1 wk after
Spinach
Spinacia oleracea
30 Apr – 7 May
25 Jul
3-4 wk
28 May
15 Aug
0 wk
24 May
5 Aug
1 wk before
Sweet potato
Ipomoea batatas
29 Jun – 13 Jul
4-6 wk
10 Aug
11 wk after
Garden tomato
Solanum lycopersicum
Greenhouse
2 – 16 Apr
21 Apr
6-8 wk
28 May
2 Jun
0 wk
Tomatillo
Physalis ixocarpa
Common Bean
Phaseolus vulgaris
Fleece
6 – 20 May
29 May
2-4 wk
3 Jun
12 Jun
1 wk after
2 Jul
5 wk after
White Cabbage
Brassica oleracea (White Cabbage-gruppen)
16 – 30 Apr
23 Jun
4-6 wk
28 May
21 Jul
0 wk
Garden pea
Pisum sativum
30 Apr – 7 May
25 Jun
3-4 wk
28 May
16 Jul
0 wk
1 Jun
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
Fleece
29 Apr – 13 May
5 May
4-6 wk
10 Jun
2 wk after
Lemon balm
Melissa officinalis
19 Mar – 2 Apr
21 May
8-10 wk
28 May
16 Jul
0 wk
2 Jul
6 Jul
5 wk after
Dill
Anethum graveolens
1 Jun
26 Jul
1 wk after
Wild chives
Allium schoenoprasum
2 – 16 Apr
4 Jun
6-8 wk
28 May
16 Jul
0 wk
1 Jun
6 Jul
1 wk after
Spearmint
Mentha spicata
5 Mar – 2 Apr
21 May
8-12 wk
28 May
16 Jul
0 wk
2 Jul
6 Jul
5 wk after
Coriander
Coriandrum sativum
28 May
15 Aug
0 wk
18 Jun
5 Aug
3 wk after
Garden sage
Salvia officinalis
21 Mar – 4 Apr
6 May
8-10 wk
30 May
1 Jul
0 wk
Common thyme
Thymus vulgaris
19 Mar – 2 Apr
11 May
8-10 wk
28 May
6 Jul
0 wk
Oregano
Origanum vulgare
2 – 16 Apr
25 May
6-8 wk
28 May
6 Jul
0 wk
2 Jul
5 wk after
Parsley
Petroselinum crispum
2 – 16 Apr
25 May
6-8 wk
28 May
6 Jul
0 wk
1 Jun
26 Jun
1 wk after
Rosemary
Salvia rosmarinus
21 Feb – 21 Mar
7 Apr
10-14 wk
30 May
16 Jun
0 wk

Annual flowers

Plant Sow indoors Transplant Direct sow
Earliest Latest Growing time Earliest Latest Rel. frost Earliest Latest Rel. frost
Morning glory
Ipomoea tricolor
Fleece
13 – 20 May
3-4 wk
10 Jun
2 wk after
Cornflower
Centaurea cyanus
28 May
16 Jul
0 wk
1 Jun
6 Jul
1 wk after
Statice
Limonium sinuatum
1 – 15 Apr
11 Apr
8-10 wk
10 Jun
2 wk after
Sweet William
Dianthus barbatus
2 – 16 Apr
6-8 wk
28 May
0 wk
13 Jun
2 wk after
Snow-on-the-mountain
Euphorbia marginata
15 – 29 Apr
25 Apr
6-8 wk
10 Jun
2 wk after
10 Aug
11 wk after
Pinnate dahlia
Dahlia × pinnata
13 – 27 Apr
27 Apr
6-8 wk
8 Jun
8 Jun
2 wk after
Pinnate dahlia (tubers)
Dahlia × pinnata
7 May – 4 Jun
11 May
4-8 wk
2 Jul
5 wk after
2 Jul
5 wk after
Foxglove
Digitalis purpurea
19 Mar – 2 Apr
8-10 wk
28 May
0 wk
18 Jun
3 wk after
Busy lizzie
Impatiens walleriana
6 Apr – 4 May
23 May
8-12 wk
29 Jun
18 Jul
5 wk after
Creeping zinnia
Sanvitalia procumbens
15 – 29 Apr
5 May
6-8 wk
10 Jun
16 Jun
2 wk after
Hyacinth bean
Dolichos lablab
Season too short
29 Apr – 13 May
4-6 wk
10 Jun
2 wk after
Chinese lantern
Physalis alkekengi
21 Mar – 4 Apr
21 Apr
8-10 wk
30 May
16 Jun
0 wk
Love in a mist
Nigella damascena
28 May
1 Jul
0 wk
1 Jun
21 Jun
1 wk after
Strawflower
Xerochrysum bracteatum
15 – 29 Apr
15 Apr
6-8 wk
10 Jun
2 wk after
10 Aug
11 wk after
Purple-top vervain
Verbena bonariensis
7 Mar – 4 Apr
21 Apr
8-12 wk
30 May
16 Jun
0 wk
Cardoon
Cynara cardunculus
18 Mar – 15 Apr
22 Mar
8-12 wk
10 Jun
2 wk after
Regal-foxtail
Ptilotus nobilis
Fleece
18 Mar – 15 Apr
28 Mar
8-12 wk
10 Jun
2 wk after
Globe amaranth
Gomphrena globosa
Fleece
15 – 29 Apr
6-8 wk
10 Jun
2 wk after
Corn poppy
Papaver rhoeas
28 May
16 Jul
0 wk
1 Jun
6 Jul
1 wk after
Snapdragon
Antirrhinum majus
5 Mar – 2 Apr
11 May
8-12 wk
28 May
6 Jul
0 wk
13 Jun
26 Jun
2 wk after
Flossflower
Ageratum houstonianum
20 Apr – 4 May
21 Apr
8-10 wk
29 Jun
5 wk after
Sweet pea
Lathyrus odoratus
2 – 23 Apr
1 Jun
5-8 wk
28 May
6 Jul
0 wk
Stock
Matthiola incana
2 – 16 Apr
4 Jun
6-8 wk
28 May
16 Jul
0 wk
18 Jun
6 Jul
3 wk after
Wormwood
Artemisia absinthium
2 – 16 Apr
5 May
6-8 wk
28 May
16 Jun
0 wk
18 Jun
3 wk after
Mexican sunflower
Tithonia rotundifolia
Greenhouse
22 Apr – 6 May
6 May
4-6 wk
3 Jun
3 Jun
1 wk after
Garden pansy
Viola × wittrockiana
19 Mar – 2 Apr
21 May
8-10 wk
28 May
16 Jul
0 wk
13 Jun
6 Jul
2 wk after
Petunia
Petunia
18 Mar – 15 Apr
11 Apr
8-12 wk
10 Jun
2 wk after
Sweet Scabious
Scabiosa atropurpurea
4 – 18 Apr
5 May
6-8 wk
30 May
16 Jun
0 wk
16 Jul
7 wk after
Common zinnia
Zinnia elegans
29 Apr – 13 May
5 May
4-6 wk
10 Jun
2 wk after
Common morning glory
Ipomoea purpurea
Fleece
6 – 20 May
12 May
3-5 wk
10 Jun
2 wk after
Garden cosmos
Cosmos bipinnatus
29 Apr – 13 May
11 May
4-6 wk
10 Jun
2 wk after
16 Jul
7 wk after
Scarlet milkweed
Asclepias curassavica
Fleece
6 Apr – 4 May
27 Apr
8-12 wk
29 Jun
5 wk after
Bee balm
Monarda didyma
5 Mar – 2 Apr
21 Apr
8-12 wk
28 May
16 Jun
0 wk
2 Jul
5 wk after
Yarrow
Achillea millefolium
2 – 16 Apr
5 Apr
6-8 wk
28 May
0 wk
18 Jun
3 wk after
Safflower
Carthamus tinctorius
28 May
16 Jun
0 wk
1 Jun
6 Jun
1 wk after
Iceland poppy
Papaver nudicaule
Season too short
2 – 16 Apr
25 May
6-8 wk
28 May
6 Jul
0 wk
10 May
26 Jun
3 wk before
Bishop's flower
Ammi majus
16 – 30 Apr
8 Jun
4-6 wk
28 May
6 Jul
0 wk
18 Jun
26 Jun
3 wk after
Drumsticks
Pycnosorus globosus
Greenhouse
11 – 25 Mar
25 Mar
10-12 wk
3 Jun
3 Jun
1 wk after
Sunflower
Helianthus annuus
13 – 20 May
15 Jun
3-4 wk
10 Jun
6 Jul
2 wk after
2 Jul
5 wk after
China aster
Callistephus chinensis
15 – 29 Apr
4 Jun
6-8 wk
10 Jun
16 Jul
2 wk after
16 Jul
7 wk after
Annual phlox
Phlox drummondii
8 – 22 Apr
5 May
6-8 wk
3 Jun
16 Jun
1 wk after
16 Jul
7 wk after
Hollyhock
Alcea rosea
2 – 16 Apr
6-8 wk
28 May
0 wk
18 Jun
3 wk after
Alpine delphinium
Delphinium elatum
5 Mar – 2 Apr
21 Apr
8-12 wk
28 May
16 Jun
0 wk
2 Jul
5 wk after
African marigold
Tagetes erecta
15 – 29 Apr
5 May
6-8 wk
10 Jun
16 Jun
2 wk after
Black-eyed Susan
Rudbeckia hirta
4 – 18 Apr
25 May
6-8 wk
30 May
6 Jul
0 wk
16 Jul
7 wk after
Wood sage
Salvia nemorosa
19 Mar – 2 Apr
11 Apr
8-10 wk
28 May
6 Jun
0 wk
2 Jul
5 wk after
Black-eyed susan vine
Thunbergia alata
Fleece
1 – 29 Apr
21 Apr
6-10 wk
10 Jun
2 wk after
California goldenpoppy
Eschscholzia californica
28 May
16 Jul
0 wk
1 Jun
6 Jul
1 wk after
Painted tongue
Salpiglossis sinuata
1 – 15 Apr
11 May
8-10 wk
10 Jun
6 Jul
2 wk after
Water forget-me-not
Myosotis scorpioides
2 – 16 Apr
5 May
6-8 wk
28 May
16 Jun
0 wk
18 Jun
3 wk after