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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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