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Method
Rel. frost
Last spring frost (0°C) 23 May Frost 1 of 10 years · 20 years of data
Frost-free season 144 days 23 May – 14 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)
4 – 18 Apr
12 Jun
5-7 wk
23 May
17 Jul
0 wk
24 May
7 Jul
0 wk
Broccoli
Brassica oleracea (Italica-gruppen)
11 – 25 Apr
24 Jun
4-6 wk
23 May
22 Jul
0 wk
24 May
12 Jul
0 wk
Chili pepper
Capsicum annuum
Season too short
11 Mar – 8 Apr
13 Mar
8-12 wk
3 Jun
2 wk after
Curly Kale
Brassica oleracea (Curly Kale-gruppen)
4 – 18 Apr
7 Jun
5-7 wk
23 May
12 Jul
0 wk
23 May
2 Jul
0 wk
Garden cucumber
Cucumis sativus
Fleece
15 – 22 May
3-4 wk
12 Jun
3 wk after
Florence Fennel
Foeniculum vulgare
22 – 29 May
4 Jun
4-5 wk
26 Jun
2 Jul
5 wk after
5 Jul
6 wk after
Butter bean
Phaseolus lunatus
Season too short
5 – 12 Jun
3-4 wk
3 Jul
6 wk after
Onion
Allium cepa (Cepa-gruppen)
28 Feb – 28 Mar
28 Mar
8-12 wk
23 May
23 May
0 wk
5 Jun
2 wk after
Onion (sets)
Allium cepa (Cepa-gruppen)
24 May
12 Jun
0 wk
24 May
2 Jun
0 wk
Maize
Zea mays
Fleece
6 – 13 May
3-4 wk
3 Jun
2 wk after
Swiss Chard
Beta vulgaris (Flavescens-gruppen)
1 – 8 May
1 Jul
3-4 wk
29 May
22 Jul
1 wk after
5 Jun
12 Jul
2 wk after
Carrot
Daucus carota subsp. sativus var. sativus
23 May
2 Jul
0 wk
23 May
22 Jun
0 wk
Palm Kale
Brassica oleracea (Palm Kale-gruppen)
4 – 18 Apr
7 Jun
5-7 wk
23 May
12 Jul
0 wk
23 May
2 Jul
0 wk
Potato
Solanum tuberosum
21 Apr – 5 May
1 Jun
4-6 wk
2 Jun
29 Jun
1 wk after
2 Jun
19 Jun
1 wk after
Ornamental Kale
Brassica oleracea (Ornamental-gruppen)
4 – 18 Apr
17 Jun
5-7 wk
23 May
22 Jul
0 wk
24 May
12 Jul
0 wk
Pumpkin
Cucurbita pepo
Fleece
15 – 22 May
2 Jun
3-4 wk
12 Jun
23 Jun
3 wk after
Beetroot
Beta vulgaris (Conditiva-gruppen)
1 – 8 May
16 Jun
3-4 wk
29 May
7 Jul
1 wk after
5 Jun
27 Jun
2 wk after
Red Cabbage
Brassica oleracea (Red Cabbage-gruppen)
11 – 25 Apr
19 Jun
4-6 wk
23 May
17 Jul
0 wk
Lettuce
Lactuca sativa
25 Apr – 2 May
6 Jul
3-4 wk
23 May
27 Jul
0 wk
24 May
17 Jul
0 wk
Savoy Cabbage
Brassica oleracea (Savoy Cabbage-gruppen)
11 – 25 Apr
19 Jun
4-6 wk
23 May
17 Jul
0 wk
Shallot (bulbs)
Allium cepa (Aggregatum-gruppen)
25 Apr – 9 May
29 May
2-4 wk
23 May
12 Jun
0 wk
23 May
2 Jun
0 wk
Shallot (sets)
Allium cepa (Aggregatum-gruppen)
24 May
12 Jun
0 wk
24 May
2 Jun
0 wk
Spinach
Spinacia oleracea
25 Apr – 2 May
21 Jul
3-4 wk
23 May
11 Aug
0 wk
20 May
1 Aug
0 wk
Sweet potato
Ipomoea batatas
17 Jun – 1 Jul
4-6 wk
29 Jul
10 wk after
Garden tomato
Solanum lycopersicum
Fleece
8 – 22 Apr
6-8 wk
3 Jun
2 wk after
Tomatillo
Physalis ixocarpa
Common Bean
Phaseolus vulgaris
15 – 29 May
2-4 wk
12 Jun
3 wk after
5 Jul
6 wk after
White Cabbage
Brassica oleracea (White Cabbage-gruppen)
11 – 25 Apr
19 Jun
4-6 wk
23 May
17 Jul
0 wk
Garden pea
Pisum sativum
25 Apr – 2 May
21 Jun
3-4 wk
23 May
12 Jul
0 wk
24 May
2 Jul
0 wk

Herbs

Plant Sow indoors Transplant Direct sow
Earliest Latest Growing time Earliest Latest Rel. frost Earliest Latest Rel. frost
Basil
Ocimum basilicum
Fleece
1 – 15 May
11 May
4-6 wk
12 Jun
3 wk after
Lemon balm
Melissa officinalis
14 – 28 Mar
17 May
8-10 wk
23 May
12 Jul
0 wk
17 Jun
2 Jul
4 wk after
Dill
Anethum graveolens
24 May
22 Jul
0 wk
Wild chives
Allium schoenoprasum
28 Mar – 11 Apr
31 May
6-8 wk
23 May
12 Jul
0 wk
24 May
2 Jul
0 wk
Spearmint
Mentha spicata
28 Feb – 28 Mar
17 May
8-12 wk
23 May
12 Jul
0 wk
17 Jun
2 Jul
4 wk after
Coriander
Coriandrum sativum
23 May
11 Aug
0 wk
5 Jun
1 Aug
2 wk after
Garden sage
Salvia officinalis
20 Mar – 3 Apr
2 May
8-10 wk
29 May
27 Jun
1 wk after
Common thyme
Thymus vulgaris
14 – 28 Mar
7 May
8-10 wk
23 May
2 Jul
0 wk
Oregano
Origanum vulgare
28 Mar – 11 Apr
21 May
6-8 wk
23 May
2 Jul
0 wk
17 Jun
22 Jun
4 wk after
Parsley
Petroselinum crispum
28 Mar – 11 Apr
21 May
6-8 wk
23 May
2 Jul
0 wk
24 May
22 Jun
0 wk
Rosemary
Salvia rosmarinus
20 Feb – 20 Mar
3 Apr
10-14 wk
29 May
12 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
Fleece
15 – 22 May
18 May
3-4 wk
12 Jun
3 wk after
Cornflower
Centaurea cyanus
23 May
12 Jul
0 wk
24 May
2 Jul
0 wk
Statice
Limonium sinuatum
3 – 17 Apr
15 Apr
8-10 wk
12 Jun
3 wk after
Sweet William
Dianthus barbatus
28 Mar – 11 Apr
6-8 wk
23 May
0 wk
2 Jun
1 wk after
Snow-on-the-mountain
Euphorbia marginata
17 Apr – 1 May
29 Apr
6-8 wk
12 Jun
3 wk after
29 Jul
10 wk after
Pinnate dahlia
Dahlia × pinnata
12 – 26 Apr
1 May
6-8 wk
7 Jun
12 Jun
2 wk after
Pinnate dahlia (tubers)
Dahlia × pinnata
Fleece
10 Apr – 8 May
4 Jun
4-8 wk
5 Jun
2 Jul
2 wk after
5 Jun
22 Jun
2 wk after
Foxglove
Digitalis purpurea
14 – 28 Mar
8-10 wk
23 May
0 wk
5 Jun
2 wk after
Busy lizzie
Impatiens walleriana
3 Apr – 1 May
29 May
8-12 wk
26 Jun
24 Jul
5 wk after
Creeping zinnia
Sanvitalia procumbens
17 Apr – 1 May
9 May
6-8 wk
12 Jun
20 Jun
3 wk after
Hyacinth bean
Dolichos lablab
Season too short
1 – 15 May
4-6 wk
12 Jun
3 wk after
Chinese lantern
Physalis alkekengi
20 Mar – 3 Apr
17 Apr
8-10 wk
29 May
12 Jun
1 wk after
Love in a mist
Nigella damascena
23 May
27 Jun
0 wk
24 May
17 Jun
0 wk
Strawflower
Xerochrysum bracteatum
17 Apr – 1 May
19 Apr
6-8 wk
12 Jun
3 wk after
29 Jul
10 wk after
Purple-top vervain
Verbena bonariensis
6 Mar – 3 Apr
17 Apr
8-12 wk
29 May
12 Jun
1 wk after
Cardoon
Cynara cardunculus
20 Mar – 17 Apr
8-12 wk
12 Jun
3 wk after
Regal-foxtail
Ptilotus nobilis
Fleece
20 Mar – 17 Apr
3 Apr
8-12 wk
12 Jun
3 wk after
Globe amaranth
Gomphrena globosa
Fleece
17 Apr – 1 May
17 Apr
6-8 wk
12 Jun
3 wk after
Corn poppy
Papaver rhoeas
23 May
12 Jul
0 wk
24 May
2 Jul
0 wk
Snapdragon
Antirrhinum majus
28 Feb – 28 Mar
7 May
8-12 wk
23 May
2 Jul
0 wk
2 Jun
22 Jun
1 wk after
Flossflower
Ageratum houstonianum
17 Apr – 1 May
25 Apr
8-10 wk
26 Jun
5 wk after
Sweet pea
Lathyrus odoratus
28 Mar – 18 Apr
28 May
5-8 wk
23 May
2 Jul
0 wk
Stock
Matthiola incana
28 Mar – 11 Apr
31 May
6-8 wk
23 May
12 Jul
0 wk
5 Jun
2 Jul
2 wk after
Wormwood
Artemisia absinthium
28 Mar – 11 Apr
1 May
6-8 wk
23 May
12 Jun
0 wk
5 Jun
2 wk after
Mexican sunflower
Tithonia rotundifolia
Greenhouse
22 Apr – 6 May
10 May
4-6 wk
3 Jun
7 Jun
2 wk after
Garden pansy
Viola × wittrockiana
14 – 28 Mar
17 May
8-10 wk
23 May
12 Jul
0 wk
2 Jun
2 Jul
1 wk after
Petunia
Petunia
20 Mar – 17 Apr
15 Apr
8-12 wk
12 Jun
3 wk after
Sweet Scabious
Scabiosa atropurpurea
3 – 17 Apr
1 May
6-8 wk
29 May
12 Jun
1 wk after
5 Jul
6 wk after
Common zinnia
Zinnia elegans
1 – 15 May
11 May
4-6 wk
12 Jun
3 wk after
Common morning glory
Ipomoea purpurea
Fleece
8 – 22 May
18 May
3-5 wk
12 Jun
3 wk after
Garden cosmos
Cosmos bipinnatus
1 – 15 May
15 May
4-6 wk
12 Jun
12 Jun
3 wk after
5 Jul
6 wk after
Scarlet milkweed
Asclepias curassavica
Fleece
3 Apr – 1 May
3 May
8-12 wk
26 Jun
28 Jun
5 wk after
Bee balm
Monarda didyma
28 Feb – 28 Mar
17 Apr
8-12 wk
23 May
12 Jun
0 wk
17 Jun
4 wk after
Yarrow
Achillea millefolium
28 Mar – 11 Apr
1 Apr
6-8 wk
23 May
0 wk
5 Jun
2 wk after
Safflower
Carthamus tinctorius
23 May
12 Jun
0 wk
24 May
2 Jun
0 wk
Iceland poppy
Papaver nudicaule
Season too short
28 Mar – 11 Apr
21 May
6-8 wk
23 May
2 Jul
0 wk
7 May
22 Jun
2 wk before
Bishop's flower
Ammi majus
11 – 25 Apr
4 Jun
4-6 wk
23 May
2 Jul
0 wk
5 Jun
22 Jun
2 wk after
Drumsticks
Pycnosorus globosus
Greenhouse
11 – 25 Mar
3 Apr
10-12 wk
3 Jun
12 Jun
2 wk after
Sunflower
Helianthus annuus
15 – 22 May
11 Jun
3-4 wk
12 Jun
2 Jul
3 wk after
17 Jun
22 Jun
4 wk after
China aster
Callistephus chinensis
17 Apr – 1 May
31 May
6-8 wk
12 Jun
12 Jul
3 wk after
5 Jul
6 wk after
Annual phlox
Phlox drummondii
8 – 22 Apr
9 May
6-8 wk
3 Jun
20 Jun
2 wk after
5 Jul
6 wk after
Hollyhock
Alcea rosea
28 Mar – 11 Apr
6-8 wk
23 May
0 wk
5 Jun
2 wk after
Alpine delphinium
Delphinium elatum
28 Feb – 28 Mar
17 Apr
8-12 wk
23 May
12 Jun
0 wk
17 Jun
4 wk after
African marigold
Tagetes erecta
17 Apr – 1 May
9 May
6-8 wk
12 Jun
20 Jun
3 wk after
Black-eyed Susan
Rudbeckia hirta
3 – 17 Apr
21 May
6-8 wk
29 May
2 Jul
1 wk after
5 Jul
6 wk after
Wood sage
Salvia nemorosa
14 – 28 Mar
7 Apr
8-10 wk
23 May
2 Jun
0 wk
17 Jun
4 wk after
Black-eyed susan vine
Thunbergia alata
Fleece
3 Apr – 1 May
27 Apr
6-10 wk
12 Jun
3 wk after
California goldenpoppy
Eschscholzia californica
23 May
12 Jul
0 wk
24 May
2 Jul
0 wk
Painted tongue
Salpiglossis sinuata
3 – 17 Apr
7 May
8-10 wk
12 Jun
2 Jul
3 wk after
Water forget-me-not
Myosotis scorpioides
28 Mar – 11 Apr
1 May
6-8 wk
23 May
12 Jun
0 wk
5 Jun
2 wk after