Seed Starting Dates for Calgary
These dates are assuming first frost-free date is June 1st (check in late winter when the last frost is expected to be).
Plant (Veggie/Fruit) | Start inside or outside | Approx starting date (inside) | Planting outside ( number of weeks relative to last frost) |
Artichoke | Inside | April 6 | On the frost-free date |
Beets | Outside (but can be started inside) | April 6-20 | 2 weeks before last frost |
Broccoli | Inside | April 6-20 | 2 weeks before last frost |
Cabbage | Inside | March 23 – May 4 | 4 weeks before last frost |
Cauliflower | Inside | April 6 – May 4 | 2 weeks before last frost |
Carrots | Outside | N/A | Early May, every few weeks until summer’s end |
Celery | Inside | March 16-30 | 1 week after last frost |
Collards | Inside | March 23 – April 6 | 4 weeks before last frost |
Corn | Outside (but can be started inside) | May 4 – June 1 | 0-2 weeks after the last frost |
Cucumber | Inside | May 11-25 | 1-2 weeks after last frost |
Eggplant | Inside | April 6 – April 27 | 2-3 weeks after last frost |
Kale | Inside | March 23 – April 6 | 4 weeks after last frost |
Kohlarbi | Outside (but can be started inside) | March 23 – April 6 | 4 weeks after last frost |
Leek | Inside | March 9-23 | 2 weeks before last frost |
Lettuce | Inside (but can be planted outside) | March 30 – April 13 | 3-4 weeks before last frost |
Melons | |||
Onions | Inside | Feb 23 – March 9 | 4 weeks before last |
Peas | Outside (but can be started inside) | March 9 – March 30 | 6-8 weeks before last frost |
Peppers | Inside | April 20 | 2 weeks after last frost |
Pumpkins | Inside | May 18 – May 25 | 2 weeks after last frost |
Potatoes | Outside | N/A | Early May |
Radish | |||
Rhubarb | |||
Spinach | Inside | March 9 – April 13 | 3-6 weeks before last frost |
Strawberries | |||
Tomatoes | Inside | April 13 – May 4 | 1-2 weeks after last frost |
Swiss Chard | Inside | April 6-20 | 2 weeks before last frost |
Squash | Inside | May 18-25 | 2 weeks after last frost |
Watermelon | Inside | May 18-25 | 2 weeks after last frost |
Zucchini | |||
Plant (Herb) | Start inside or outside | Approx starting date (inside) | Planting outside ( number of weeks relative to last frost) |
Basil | Inside | April 27 | 1 week after last frost |
Mustard | Outside (but can be started inside) | March 23 – April 6 | 4 weeks before last frost |
Oregano | |||
Parsley | Inside | March 2 – March 16 | 2-3 weeks before |
Rosemary | |||
Sage | |||
Savory | |||
French Tarragon | |||
Thyme | |||
Plant (Flowers) | Start inside or outside | Approx starting date (inside) | Planting outside ( number of weeks relative to last frost) |
Ageratum | Inside | April 6-20 | On frost-free date |
Agrostemma (Corn Cockle) | Outside (but can be started inside) | April 6-20 | On frost-free date |
Amaranthus | Inside | April 27 – May 11 | 1 week after last frost |
Ammi (False Queen Anne’s Lace) | Outside (but can be started inside) | April 6-20 | On frost-free date |
Artemisia (Sweet Annie) | Inside | April 6-20 | On frost-free date |
Asclepias (Butterfly Weed) | Inside | March 9-23 | On frost-free date |
Aster, China | Inside | April 6-20 | On frost-free date |
Bells of Ireland | Outside directly | April 6-20 | On frost-free date |
Calendula | Outside (but can be started inside) | April 6-20 | On frost-free date |
Calibrachoa | |||
Carthamus (Safflower) | Outside (but may be started inside) | April 20 – May 4 | On frost-free date |
Castor Bean | Inside | April 13-27 | One week after last frost |
Celosia | Inside | April 13-27 | One weeks after last frost |
Centaurea (Bachelor’s Button) | Outside (but can be started inside) | April 6-20 | On frost-free date |
Coleus | Inside | April 13 | One week after last frost |
Cosmos | Outside (but can be started inside) | April 13-27 | On frost-free date |
Delphinium | Inside | Feb 9 – March 23 | On frost-free date |
Dianthus (Sweet William) | Inside | Feb 23 – March 23 | 1-2 weeks before last frost |
Digitalis (Foxglove) | Inside | March 9-23 | On frost-free date |
Forget-Me-Not | Inside | March 30 – April 6 | On frost-free date |
Hibiscus | Inside | March 30 – April 13 | 1 week after last frost |
Hollyhock | Inside | March 23 – April 6 | One week after last frost |
Impatiens | Inside | March 30 – April 13 | 1 week after last frost |
Ornamental Kale | Inside | April 6-20 | On frost-free date |
Lupine | Inside | March 2-9 | 2 weeks before last frost |
Marigold | Inside | April 13-27 | One week after last frost |
Morning Glory | Inside | May 25 – June 8 | 3-4 weeks after last frost |
Nigella | Outside (but can be started inside) | April 20 – May 4 | On frost-free date |
Pansies | |||
Phlox | Outside directly | April 6 | 1-2 weeks before |
Petunia | Inside | March 23 – April 6 | On frost-free date |
California Poppy | Outside (but can be started inside) | May 11-18 | On frost-free date |
Corn Poppy | Outside (but can be started inside) | May 11-18 | On frost-free date |
Iceland Poppy | Inside | April 6-20 | On frost-free date |
Ptilotus | Inside | April 6-20 | On frost-free date |
Rudbeckia(Black Eyed Susan) | Inside | March 23 – April 6 | On frost-free date |
Salvia | Inside | March 23 – April 20 | On frost-free date |
Snapdragons | Inside | March 23 – April 6 | On frost-free date |
Statice | Inside | April 6 | On frost-free date |
Sunflowers | Outside (but can be started inside) | May 4-11 | On frost-free date |
Sweet Pea | Outside (but can be started inside) | April 6-27 | 1-2 weeks before last frost |
Thunbergina (Black Eyed Susan Vine) | Inside | April 6-20 | On frost-free date |
Verbena | Inside | March 9 – April 6 | On frost-free date |
Viola (Pansy) | Inside | Feb 23 – March 30 | 1-2 weeks before last frost |
Yarrow | Inside | March 23 – April 6 | On frost-free date |
Zinna | Inside | May 11 | 1 week after last frost |
Partial Source: http://www.johnnyseeds.com/e-pdgseedstart.aspx
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