Seed-Starting Date Calculator

Enter spring frost-free date (include year):

mm/dd/yyyy
Crop Number of weeks to start seeds before setting-out date When to start inside   Setting-out date
From To Safe time to set out plants (relative to frost-free date) From To
Artichoke 8
19-Jul
on frost-free date
13-Sep
Basil 6
9-Aug
1 week after
20-Sep
Beets* 4 to 6
19-Jul
2-Aug
2 weeks before
30-Aug
Broccoli 4 to 6
19-Jul
2-Aug
2 weeks before
30-Aug
Cabbage 4 to 6
5-Jul
16-Aug
4 weeks before
16-Aug
13-Sep
Cauliflower 4 to 6
19-Jul
16-Aug
2 weeks before
30-Aug
13-Sep
Celery & celeriac 10 to 12
28-Jun
12-Jul
1 week after
20-Sep
Collards 4 to 6
5-Jul
19-Jul
4 weeks before
16-Aug
Corn salad/mache 4 to 6
21-Jun
26-Jul
3 to 6 weeks before
2-Aug
23-Aug
Corn* 2 to 4
16-Aug
13-Sep
0 to 2 weeks after
13-Sep
27-Sep
Cucumber 3 to 4
23-Aug
6-Sep
1 to 2 weeks after
20-Sep
27-Sep
Eggplant 8 to 10
19-Jul
9-Aug
2 to 3 weeks after
27-Sep
4-Oct
Kale 4 to 6
5-Jul
19-Jul
4 weeks before
16-Aug
Kohlrabi* 4 to 6
5-Jul
19-Jul
4 weeks before
16-Aug
Leeks 8 to 10
21-Jun
5-Jul
2 weeks before
30-Aug
Lettuce 4 to 5
12-Jul
26-Jul
3 to 4 weeks before
16-Aug
23-Aug
Melons 3 to 4
30-Aug
6-Sep
2 weeks after
27-Sep
Mustard* 4 to 6
5-Jul
19-Jul
4 weeks before
16-Aug
Okra* 4 to 6
16-Aug
13-Sep
2 to 4 weeks after
27-Sep
11-Oct
Onions 8 to 10
7-Jun
21-Jun
4 weeks before
16-Aug
Parsley 9 to 10
14-Jun
28-Jun
2 to 3 weeks before
23-Aug
30-Aug
Peas* 3 to 4
21-Jun
12-Jul
6 to 8 weeks before
19-Jul
2-Aug
Peppers 8
2-Aug
2 weeks after
27-Sep
Pumpkins 3 to 4
30-Aug
6-Sep
2 weeks after
27-Sep
Spinach 4 to 6
21-Jun
26-Jul
3 to 6 weeks before
2-Aug
23-Aug
Squash 3 to 4
30-Aug
6-Sep
2 weeks after
27-Sep
Swiss chard 4 to 6
19-Jul
2-Aug
2 weeks before
30-Aug
Tomatoes 6 to 8
26-Jul
16-Aug
1 to 2 weeks after
20-Sep
27-Sep
Watermelon 3 to 4
30-Aug
6-Sep
2 weeks after
27-Sep

Ageratum 6 to 8
19-Jul
2-Aug
on frost-free date
13-Sep
Agrostemma (Corn Cockle)* 6 to 8
19-Jul
2-Aug
on frost-free date
13-Sep
Amaranthus 4 to 6
9-Aug
23-Aug
1 week after
20-Sep
Ammi (False Queen Anne's Lace)* 6 to 8
19-Jul
2-Aug
on frost-free date
13-Sep
Artemisia (Sweet Annie) 6 to 8
19-Jul
2-Aug
on frost-free date
13-Sep
Asclepias (Butterfly Weed) 10 to 12
21-Jun
5-Jul
on frost-free date
13-Sep
Aster, China 6 to 8
19-Jul
2-Aug
on frost-free date
13-Sep
Bells of Ireland** 6 to 8
19-Jul
2-Aug
on frost-free date
13-Sep
Calendula* 6 to 8
19-Jul
2-Aug
on frost-free date
13-Sep
Cardoon 6 to 8
19-Jul
2-Aug
on frost-free date
13-Sep
Carthamus (Safflower)* 4 to 6
2-Aug
16-Aug
on frost-free date
13-Sep
Castor Bean 6 to 8
26-Jul
9-Aug
1 week after
20-Sep
Celosia 6 to 8
26-Jul
9-Aug
1 week after
20-Sep
Centaurea (Bachelor's Button)* 6 to 8
19-Jul
2-Aug
on frost-free date
13-Sep
Chinese Lanterns 8 to 12
21-Jun
19-Jul
on frost-free date
13-Sep
Coleus 8
26-Jul
1 week after
20-Sep
Cosmos* 5 to 7
26-Jul
9-Aug
on frost-free date
13-Sep
Craspedia (Drumstick Flower) 8 to 10
5-Jul
19-Jul
on frost-free date
13-Sep
Datura (Angel's Trumpet) 8 to 12
5-Jul
9-Aug
2 to 3 weeks after
27-Sep
4-Oct
Delphinium 10 to 16
24-May
5-Jul
on frost-free date
13-Sep
Dianthus (Sweet William) 10 to 12
7-Jun
28-Jun
1 to 2 weeks before
30-Aug
6-Sep
Digitalis (Foxglove) 10 to 12
21-Jun
5-Jul
on frost-free date
13-Sep
Eucalyptus 10 to 12
21-Jun
5-Jul
on frost-free date
13-Sep
Euphorbia (Snow-on-the-Mountain)* 4 to 6
2-Aug
16-Aug
on frost-free date
13-Sep
Flower Collections & Mixes* 6 to 8
19-Jul
2-Aug
on frost-free date
13-Sep
Forget-Me-Not 8 to 9
12-Jul
19-Jul
on frost-free date
13-Sep
Gaillardia (Blanket Flower) 8 to 10
5-Jul
19-Jul
on frost-free date
13-Sep
Gomphrena (Globe Amaranth) 6 to 8
19-Jul
2-Aug
on frost-free date
13-Sep
Helianthus maximillianii 8 to 10
5-Jul
19-Jul
on frost-free date
13-Sep
Hibiscus 8 to 10
12-Jul
26-Jul
1 week after
20-Sep
Hollyhock 8 to 10
5-Jul
19-Jul
on frost-free date
13-Sep
Hyacinth Bean 4 to 6
9-Aug
23-Aug
1 week after
20-Sep
Impatiens 8 to 10
12-Jul
26-Jul
1 week after
20-Sep
Kale, Ornamental 6 to 8
19-Jul
2-Aug
on frost-free date
13-Sep
Larkspur* 6 to 8
19-Jul
2-Aug
on frost-free date
13-Sep
Lisianthus 12 to 13
14-Jun
21-Jun
on frost-free date
13-Sep
Lupine 6 to 8
5-Jul
19-Jul
2 weeks before
30-Aug
Marigold 6 to 8
26-Jul
9-Aug
1 week after
20-Sep
Monarda (Bee Balm) 6 to 8
19-Jul
2-Aug
on frost-free date
13-Sep
Morning Glory 3 to 4
6-Sep
20-Sep
3 to 4 weeks after
4-Oct
11-Oct
Nigella* 4 to 6
2-Aug
16-Aug
on frost-free date
13-Sep
Phlox** 4
19-Jul
1 to 2 weeks before
30-Aug
6-Sep
Pepper, Ornamental 8
26-Jul
1 week after
20-Sep
Petunia 8 to 10
5-Jul
19-Jul
on frost-free date
13-Sep
Polygonum (Prince's Feather) 8 to 10
5-Jul
19-Jul
on frost-free date
13-Sep
California Poppy* 2 to 3
23-Aug
30-Aug
on frost-free date
13-Sep
Corn Poppy* 2 to 3
23-Aug
30-Aug
on frost-free date
13-Sep
Iceland Poppy 6 to 8
19-Jul
2-Aug
on frost-free date
13-Sep
Ptilotus 6 to 8
19-Jul
2-Aug
on frost-free date
13-Sep
Rudbeckia (Black Eyed Susan) 8 to 10
5-Jul
19-Jul
on frost-free date
13-Sep
Salpiglossis (Painted Tongue) 4 to 6
2-Aug
16-Aug
on frost-free date
13-Sep
Salvia 6 to 8
5-Jul
2-Aug
on frost-free date
13-Sep
Sanvitalia 6 to 8
19-Jul
2-Aug
on frost-free date
13-Sep
Scabiosa (Pincushion Flower) 4 to 6
2-Aug
16-Aug
on frost-free date
13-Sep
Scarlet Runner Bean 2 to 3
soil 60 degrees
Snapdragon 8 to 10
5-Jul
19-Jul
on frost-free date
13-Sep
Statice 8
19-Jul
on frost-free date
13-Sep
Stock 8 to 10
5-Jul
19-Jul
on frost-free date
13-Sep
Sunflowers* 3-4
16-Aug
23-Aug
on frost-free date
13-Sep
Strawflower 6 to 8
19-Jul
2-Aug
on frost-free date
13-Sep
Sweet Pea* 4 to 6
19-Jul
9-Aug
1 to 2 weeks before
30-Aug
6-Sep
Thunbergia (Black Eyed Susan Vine) 6 to 8
19-Jul
2-Aug
on frost-free date
13-Sep
Tithonia (Mexican Sunflower)* 6
9-Aug
1 week after
20-Sep
Verbena 8 to 12
21-Jun
19-Jul
on frost-free date
13-Sep
Viola (Pansy) 8 to 12
7-Jun
12-Jul
1 to 2 weeks before
30-Aug
6-Sep
Yarrow 8 to 12
5-Jul
19-Jul
on frost-free date
13-Sep
Zinnia 4
23-Aug
1 week after
20-Sep
* Usually direct-sown, but may be started indoors
** Specifically recommended for direct seeding outdoors
Note: Dates are the same from year to year, but this table requires a year for computation simplicity