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Method
Rel. frost
Last spring frost (0°C) 15 May Normal year · 20 years of data
Frost-free season 144 days 15 May – 6 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)
27 Mar – 10 Apr
19 Jun
5-7 wk
15 May
24 Jul
0 wk
9 May
14 Jul
1 wk before
Broccoli
Brassica oleracea (Italica-gruppen)
3 – 17 Apr
1 Jul
4-6 wk
15 May
29 Jul
0 wk
9 May
19 Jul
1 wk before
Chili pepper
Capsicum annuum
24 Mar – 21 Apr
9 Apr
8-12 wk
16 Jun
5 wk after
Curly Kale
Brassica oleracea (Curly Kale-gruppen)
27 Mar – 10 Apr
14 Jun
5-7 wk
15 May
19 Jul
0 wk
2 May
9 Jul
2 wk before
Garden cucumber
Cucumis sativus
19 – 26 May
16 Jun
3-4 wk
16 Jun
7 Jul
5 wk after
Florence Fennel
Foeniculum vulgare
12 – 19 May
5 Jun
4-5 wk
16 Jun
3 Jul
5 wk after
25 Jun
6 wk after
Butter bean
Phaseolus lunatus
Fleece
19 – 26 Jun
3-4 wk
17 Jul
9 wk after
Onion
Allium cepa (Cepa-gruppen)
20 Feb – 20 Mar
4 Apr
8-12 wk
15 May
30 May
0 wk
28 May
2 wk after
Onion (sets)
Allium cepa (Cepa-gruppen)
9 May
19 Jun
1 wk before
9 May
9 Jun
1 wk before
Maize
Zea mays
30 Apr – 7 May
6 Jun
3-4 wk
28 May
27 Jun
2 wk after
Swiss Chard
Beta vulgaris (Flavescens-gruppen)
19 – 26 Apr
8 Jul
3-4 wk
17 May
29 Jul
0 wk
28 May
19 Jul
2 wk after
Carrot
Daucus carota subsp. sativus var. sativus
15 May
9 Jul
0 wk
2 May
29 Jun
2 wk before
Palm Kale
Brassica oleracea (Palm Kale-gruppen)
27 Mar – 10 Apr
14 Jun
5-7 wk
15 May
19 Jul
0 wk
2 May
9 Jul
2 wk before
Potato
Solanum tuberosum
8 – 22 Apr
11 Jun
4-6 wk
20 May
9 Jul
1 wk after
20 May
29 Jun
1 wk after
Ornamental Kale
Brassica oleracea (Ornamental-gruppen)
27 Mar – 10 Apr
24 Jun
5-7 wk
15 May
29 Jul
0 wk
9 May
19 Jul
1 wk before
Pumpkin
Cucurbita pepo
19 – 26 May
29 Jun
3-4 wk
16 Jun
20 Jul
5 wk after
Beetroot
Beta vulgaris (Conditiva-gruppen)
19 – 26 Apr
2 Jul
3-4 wk
17 May
23 Jul
0 wk
28 May
13 Jul
2 wk after
Red Cabbage
Brassica oleracea (Red Cabbage-gruppen)
3 – 17 Apr
26 Jun
4-6 wk
15 May
24 Jul
0 wk
Lettuce
Lactuca sativa
17 – 24 Apr
13 Jul
3-4 wk
15 May
3 Aug
0 wk
9 May
24 Jul
1 wk before
Savoy Cabbage
Brassica oleracea (Savoy Cabbage-gruppen)
3 – 17 Apr
26 Jun
4-6 wk
15 May
24 Jul
0 wk
Shallot (bulbs)
Allium cepa (Aggregatum-gruppen)
4 – 18 Apr
5 Jun
2-4 wk
2 May
19 Jun
2 wk before
2 May
9 Jun
2 wk before
Shallot (sets)
Allium cepa (Aggregatum-gruppen)
9 May
19 Jun
1 wk before
9 May
9 Jun
1 wk before
Spinach
Spinacia oleracea
17 – 24 Apr
28 Jul
3-4 wk
15 May
18 Aug
0 wk
25 Apr
8 Aug
3 wk before
Sweet potato
Ipomoea batatas
16 – 30 Jun
4-6 wk
28 Jul
11 wk after
Garden tomato
Solanum lycopersicum
2 – 16 Apr
16 May
6-8 wk
28 May
27 Jun
2 wk after
Tomatillo
Physalis ixocarpa
Common Bean
Phaseolus vulgaris
30 Apr – 14 May
1 Jul
2-4 wk
28 May
15 Jul
2 wk after
25 Jun
5 Jul
6 wk after
White Cabbage
Brassica oleracea (White Cabbage-gruppen)
3 – 17 Apr
26 Jun
4-6 wk
15 May
24 Jul
0 wk
Garden pea
Pisum sativum
17 – 24 Apr
28 Jun
3-4 wk
15 May
19 Jul
0 wk
9 May
9 Jul
1 wk before

Herbs

Plant Sow indoors Transplant Direct sow
Earliest Latest Growing time Earliest Latest Rel. frost Earliest Latest Rel. frost
Basil
Ocimum basilicum
5 – 19 May
7 Jun
4-6 wk
16 Jun
5 Jul
5 wk after
Lemon balm
Melissa officinalis
6 – 20 Mar
24 May
8-10 wk
15 May
19 Jul
0 wk
10 Jun
9 Jul
4 wk after
Dill
Anethum graveolens
9 May
29 Jul
1 wk before
Wild chives
Allium schoenoprasum
20 Mar – 3 Apr
7 Jun
6-8 wk
15 May
19 Jul
0 wk
9 May
9 Jul
1 wk before
Spearmint
Mentha spicata
20 Feb – 20 Mar
24 May
8-12 wk
15 May
19 Jul
0 wk
10 Jun
9 Jul
4 wk after
Coriander
Coriandrum sativum
15 May
18 Aug
0 wk
28 May
8 Aug
2 wk after
Garden sage
Salvia officinalis
8 – 22 Mar
9 May
8-10 wk
17 May
4 Jul
0 wk
Common thyme
Thymus vulgaris
6 – 20 Mar
14 May
8-10 wk
15 May
9 Jul
0 wk
Oregano
Origanum vulgare
20 Mar – 3 Apr
28 May
6-8 wk
15 May
9 Jul
0 wk
10 Jun
29 Jun
4 wk after
Parsley
Petroselinum crispum
20 Mar – 3 Apr
28 May
6-8 wk
15 May
9 Jul
0 wk
9 May
29 Jun
1 wk before
Rosemary
Salvia rosmarinus
8 Feb – 8 Mar
9 Apr
10-14 wk
17 May
18 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
19 – 26 May
14 Jun
3-4 wk
16 Jun
5 Jul
5 wk after
Cornflower
Centaurea cyanus
15 May
19 Jul
0 wk
9 May
9 Jul
1 wk before
Statice
Limonium sinuatum
19 Mar – 2 Apr
14 May
8-10 wk
28 May
9 Jul
2 wk after
Sweet William
Dianthus barbatus
20 Mar – 3 Apr
6-8 wk
15 May
0 wk
20 May
1 wk after
Snow-on-the-mountain
Euphorbia marginata
2 – 16 Apr
28 May
6-8 wk
28 May
9 Jul
2 wk after
28 Jul
11 wk after
Pinnate dahlia
Dahlia × pinnata
31 Mar – 14 Apr
28 May
6-8 wk
26 May
9 Jul
2 wk after
Pinnate dahlia (tubers)
Dahlia × pinnata
15 Apr – 13 May
11 Jun
4-8 wk
10 Jun
9 Jul
4 wk after
10 Jun
29 Jun
4 wk after
Foxglove
Digitalis purpurea
6 – 20 Mar
8-10 wk
15 May
0 wk
28 May
2 wk after
Busy lizzie
Impatiens walleriana
24 Mar – 21 Apr
7 Jul
8-12 wk
16 Jun
1 Sep
5 wk after
Creeping zinnia
Sanvitalia procumbens
2 – 16 Apr
7 Jun
6-8 wk
28 May
19 Jul
2 wk after
Hyacinth bean
Dolichos lablab
Fleece
5 – 19 May
8 May
4-6 wk
16 Jun
5 wk after
Chinese lantern
Physalis alkekengi
8 – 22 Mar
24 Apr
8-10 wk
17 May
19 Jun
0 wk
Love in a mist
Nigella damascena
15 May
4 Jul
0 wk
9 May
24 Jun
1 wk before
Strawflower
Xerochrysum bracteatum
2 – 16 Apr
18 May
6-8 wk
28 May
29 Jun
2 wk after
28 Jul
11 wk after
Purple-top vervain
Verbena bonariensis
22 Feb – 22 Mar
24 Apr
8-12 wk
17 May
19 Jun
0 wk
Cardoon
Cynara cardunculus
5 Mar – 2 Apr
25 Mar
8-12 wk
28 May
2 wk after
Regal-foxtail
Ptilotus nobilis
24 Mar – 21 Apr
30 Apr
8-12 wk
16 Jun
25 Jun
5 wk after
Globe amaranth
Gomphrena globosa
21 Apr – 5 May
14 May
6-8 wk
16 Jun
25 Jun
5 wk after
Corn poppy
Papaver rhoeas
15 May
19 Jul
0 wk
9 May
9 Jul
1 wk before
Snapdragon
Antirrhinum majus
20 Feb – 20 Mar
14 May
8-12 wk
15 May
9 Jul
0 wk
20 May
29 Jun
1 wk after
Flossflower
Ageratum houstonianum
7 – 21 Apr
24 May
8-10 wk
16 Jun
19 Jul
5 wk after
Sweet pea
Lathyrus odoratus
20 Mar – 10 Apr
4 Jun
5-8 wk
15 May
9 Jul
0 wk
Stock
Matthiola incana
20 Mar – 3 Apr
7 Jun
6-8 wk
15 May
19 Jul
0 wk
28 May
9 Jul
2 wk after
Wormwood
Artemisia absinthium
20 Mar – 3 Apr
8 May
6-8 wk
15 May
19 Jun
0 wk
28 May
9 Jun
2 wk after
Mexican sunflower
Tithonia rotundifolia
5 – 19 May
23 May
4-6 wk
16 Jun
20 Jun
5 wk after
Garden pansy
Viola × wittrockiana
6 – 20 Mar
24 May
8-10 wk
15 May
19 Jul
0 wk
20 May
9 Jul
1 wk after
Petunia
Petunia
5 Mar – 2 Apr
14 May
8-12 wk
28 May
9 Jul
2 wk after
Sweet Scabious
Scabiosa atropurpurea
22 Mar – 5 Apr
8 May
6-8 wk
17 May
19 Jun
0 wk
25 Jun
6 wk after
Common zinnia
Zinnia elegans
16 – 30 Apr
19 Jun
4-6 wk
28 May
17 Jul
2 wk after
Common morning glory
Ipomoea purpurea
12 – 26 May
14 Jun
3-5 wk
16 Jun
5 Jul
5 wk after
Garden cosmos
Cosmos bipinnatus
16 – 30 Apr
11 Jun
4-6 wk
28 May
9 Jul
2 wk after
25 Jun
29 Jun
6 wk after
Scarlet milkweed
Asclepias curassavica
14 Apr – 12 May
30 May
8-12 wk
7 Jul
25 Jul
8 wk after
Bee balm
Monarda didyma
20 Feb – 20 Mar
24 Apr
8-12 wk
15 May
19 Jun
0 wk
10 Jun
4 wk after
Yarrow
Achillea millefolium
20 Mar – 3 Apr
8 Apr
6-8 wk
15 May
20 May
0 wk
28 May
2 wk after
Safflower
Carthamus tinctorius
15 May
19 Jun
0 wk
9 May
9 Jun
1 wk before
Iceland poppy
Papaver nudicaule
Season too short
20 Mar – 3 Apr
28 May
6-8 wk
15 May
9 Jul
0 wk
30 Mar
29 Jun
7 wk before
Bishop's flower
Ammi majus
3 – 17 Apr
11 Jun
4-6 wk
15 May
9 Jul
0 wk
28 May
29 Jun
2 wk after
Drumsticks
Pycnosorus globosus
24 Mar – 7 Apr
8 Apr
10-12 wk
16 Jun
17 Jun
5 wk after
Sunflower
Helianthus annuus
30 Apr – 7 May
17 Jun
3-4 wk
28 May
8 Jul
2 wk after
10 Jun
28 Jun
4 wk after
China aster
Callistephus chinensis
2 – 16 Apr
6 Jun
6-8 wk
28 May
18 Jul
2 wk after
25 Jun
8 Jul
6 wk after
Annual phlox
Phlox drummondii
26 Mar – 9 Apr
7 Jun
6-8 wk
21 May
19 Jul
1 wk after
25 Jun
9 Jul
6 wk after
Hollyhock
Alcea rosea
20 Mar – 3 Apr
6-8 wk
15 May
0 wk
28 May
2 wk after
Alpine delphinium
Delphinium elatum
20 Feb – 20 Mar
24 Apr
8-12 wk
15 May
19 Jun
0 wk
10 Jun
4 wk after
African marigold
Tagetes erecta
2 – 16 Apr
7 Jun
6-8 wk
28 May
19 Jul
2 wk after
Black-eyed Susan
Rudbeckia hirta
22 Mar – 5 Apr
27 May
6-8 wk
17 May
8 Jul
0 wk
25 Jun
28 Jun
6 wk after
Wood sage
Salvia nemorosa
6 – 20 Mar
14 Apr
8-10 wk
15 May
9 Jun
0 wk
10 Jun
4 wk after
Black-eyed susan vine
Thunbergia alata
7 Apr – 5 May
24 May
6-10 wk
16 Jun
5 Jul
5 wk after
California goldenpoppy
Eschscholzia californica
15 May
19 Jul
0 wk
9 May
9 Jul
1 wk before
Painted tongue
Salpiglossis sinuata
19 Mar – 2 Apr
8 May
8-10 wk
28 May
3 Jul
2 wk after
Water forget-me-not
Myosotis scorpioides
20 Mar – 3 Apr
8 May
6-8 wk
15 May
19 Jun
0 wk
28 May
9 Jun
2 wk after