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Rel. frost
Last spring frost (0°C) 10 May Normal year · 20 years of data
Frost-free season 157 days 10 May – 14 Oct

Vegetables

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