Seed Starting and Planting Date Calculator for Peterborough, ON

Find the best dates for planting, transplanting, and harvesting vegetables, herbs, and fruit in your garden! Our free planting calendar calculates the best time to start seeds indoors and outdoors, and when to plant young plants outside. Planting dates are based on frost dates, which are customized to your location and planting zone.

Frost dates are calculated from historical climate data and are a good way to know when it's "typical" to start planting in your area. However, they are not a replacement for good judgment! Obviously, you need to be aware of local weather during the gardening season and plant accordingly. Other factors that can also influence your planting dates include soil temperature, altitude and slope of land, nearby waters, and day length. Also, it's recommended that you keep records of your garden's conditions each year to plan more accurately in the future.

On the chart below, please note:

  • The Start Seeds Indoors column shows when to start vegetable and fruit seeds indoors. Learn how to start seeds indoors here
  • The Transplant Seedlings column shows when to begin planting young plants outdoors. This includes plants grown from seeds at home and plants bought from a nursery.
  • The Start Seeds Outdoors column shows when to start vegetable and fruit seeds outdoors. Some seeds should be sown directly in the garden, rather than started indoors or transplanted.
  • When no dates appear in the chart, that starting method is not recommended for that particular vegetable.
  • The Frost Dates list the favorable planting dates based on your area's frost dates.
  • The Moon Dates list the favorable planting dates based on your area's frost dates and Moon phases.
  • Click on the name of a plant to see our corresponding Growing Guide.
33% probability of frost free after May 12 (at PETERBOROUGH TRENT U, ON climate station).
Crop Based on Frost Dates   Based on Moon Dates
Start Seeds IndoorsTransplant SeedlingsStart Seeds Outdoors
Beans May 19-Jun 9
May 19-29
Beets Apr 28-May 19
Apr 30-May 14
Broccoli Mar 31-Apr 14
Mar 31
Apr 21-May 12
Apr 21-29
Brussels Sprouts Mar 31-Apr 14
Mar 31
Apr 14-May 5
Apr 15-29
Cabbage Mar 17-31
Mar 17-31
Apr 14-28
Apr 15-28
Cantaloupe Apr 14-21
Apr 15-21
May 26-Jun 16
May 26-29, Jun 13-16
Carrots Apr 7-21
Apr 7-14
Cauliflower Mar 31-Apr 14
Mar 31
Apr 14-28
Apr 15-28
Celery Mar 2-17
Mar 17
May 19-Jun 2
May 19-29
Collards Mar 31-Apr 14
Mar 31
Apr 14-May 5
Apr 15-29
Corn May 12-26
May 15-26
Cucumbers Apr 14-21
Apr 15-21
May 26-Jun 16
May 26-29, Jun 13-16
Eggplants Mar 2-17
Mar 17
May 26-Jun 16
May 26-29, Jun 13-16
Kale Mar 31-Apr 14
Mar 31
Apr 14-May 5
Apr 15-29
Kohlrabi Apr 14-May 5
Apr 15-29
Leeks Mar 2-17
Mar 17
Apr 14-May 5
Apr 15-29
Lettuce Mar 31-Apr 14
Mar 31
Apr 28-May 26
Apr 28-29, May 15-26
Okra May 26-Jun 9
May 26-29
Onions Apr 14-May 5
Apr 14, Apr 30-May 5
Parsnips Apr 21-May 12
Apr 30-May 12
Peas Mar 31-Apr 21
Mar 31, Apr 15-21
Peppers Mar 2-17
Mar 17
May 26-Jun 16
May 26-29, Jun 13-16
Potatoes May 5-26
May 5-14
Pumpkins Apr 14-28
Apr 15-28
May 26-Jun 16
May 26-29, Jun 13-16
Radishes Mar 17-Apr 7
Apr 1- 7
Spinach Mar 31-Apr 21
Mar 31, Apr 15-21
Squash Apr 14-28
Apr 15-28
May 26-Jun 16
May 26-29, Jun 13-16
Sweet Potatoes Apr 14-21
Apr 14
May 26-Jun 16
May 30-Jun 12
Swiss Chard Mar 31-Apr 14
Mar 31
Apr 21-28
Apr 21-28
Tomatoes Mar 17-31
Mar 17-31
May 19-Jun 9
May 19-29
Turnips Apr 14-May 5
Apr 14, Apr 30-May 5
Watermelons Apr 14-21
Apr 15-21
May 26-Jun 16
May 26-29, Jun 13-16