Planting planner: Centennial, Colorado
Typical last spring frost May 5 (1 spring in 10 later than May 17). Typical first fall frost October 8 (1 fall in 10 earlier than September 25). Growing season about 154 days.
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Your season is too short for a separate fall planting of cabbage: sown late enough to be a fall crop, it wouldn't be ready before the typical first frost. Your spring planting is your harvest.
January
Nothing to start this month.
February
- February 17 to March 17: Broccoli and cabbage (start seeds indoors)
March
- March 3 to 31: Cauliflower (start seeds indoors)
- March 17 to April 7: Eggplant (start seeds indoors)
- March 24 to April 7: Peppers (start seeds indoors)
- March 31 to April 14: Tomatoes (start seeds indoors)
April
- April 7 to 21: Peas, spinach, lettuce, radishes, onion sets, turnips (sow outdoors)
- April 7 to 21: Broccoli and cabbage (plant out)
- April 21 to May 5: Beets, carrots, potatoes, Swiss chard (plant outdoors)
- April 21 to May 5: Cauliflower (plant out)
May
- May 5: Snap beans, sweet corn, cucumbers, summer squash (sow outdoors)
- May 19: Tomatoes, peppers, eggplant (plant out)
- May 19: Melons, winter squash, pumpkins, lima beans (sow outdoors)
June
- June 2 to 16: Broccoli for fall (start seeds)
July
- July 12: Snap beans for fall (last date to sow)
- July 16: Carrots for fall (last date to sow)
- July 17: Cucumbers for fall (last date to sow)
- July 21: Peas for fall (last date to sow)
- July 22: Summer squash for fall (last date to sow)
- July 26: Leaf lettuce and beets for fall (last date to sow)
August
- August 5: Turnips and kohlrabi for fall (last date to sow)
- August 15: Spinach for fall (last date to sow)
- August 25: Radishes for fall (last date to sow)
September
- September 25: Tomatoes, peppers, squash, melons, cucumbers (watch the forecast)
October
- October 24 to 31: Garlic (plant cloves)
November
Nothing to start this month.
December
Nothing to start this month.
Dates from NOAA's 1991 to 2020 climate normals for Denver Centennial Airport (station USW00093067), 2 miles from the center of Centennial. Planting rules: Colorado State University Extension GardenNotes #720 (spring), Virginia Cooperative Extension 426-334 (fall crops), University of Minnesota Extension (garlic). Spring bulbs: plant when the soil has cooled to about 50 to 55°F, until a couple of weeks before the ground freezes (University of Wisconsin–Madison Extension). Full details: https://lastfrostdate.com/frost-dates/colorado/centennial/