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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