Planting planner: Westminster, Colorado
Typical last spring frost May 2 (1 spring in 10 later than May 14). Typical first fall frost October 11 (1 fall in 10 earlier than September 26). Growing season about 160 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 14 to March 14: Broccoli and cabbage (start seeds indoors)
- February 28 to March 28: Cauliflower (start seeds indoors)
March
- March 14 to April 4: Eggplant (start seeds indoors)
- March 21 to April 4: Peppers (start seeds indoors)
- March 28 to April 11: Tomatoes (start seeds indoors)
April
- April 4 to 18: Peas, spinach, lettuce, radishes, onion sets, turnips (sow outdoors)
- April 4 to 18: Broccoli and cabbage (plant out)
- April 18 to May 2: Beets, carrots, potatoes, Swiss chard (plant outdoors)
- April 18 to May 2: Cauliflower (plant out)
May
- May 2: Snap beans, sweet corn, cucumbers, summer squash (sow outdoors)
- May 16: Tomatoes, peppers, eggplant (plant out)
- May 16: Melons, winter squash, pumpkins, lima beans (sow outdoors)
June
- June 5 to 19: Broccoli for fall (start seeds)
July
- July 15: Snap beans for fall (last date to sow)
- July 19: Carrots for fall (last date to sow)
- July 20: Cucumbers for fall (last date to sow)
- July 24: Peas for fall (last date to sow)
- July 25: Summer squash for fall (last date to sow)
- July 29: Leaf lettuce and beets for fall (last date to sow)
August
- August 8: Turnips and kohlrabi for fall (last date to sow)
- August 18: Spinach for fall (last date to sow)
- August 28: Radishes for fall (last date to sow)
September
- September 26: Tomatoes, peppers, squash, melons, cucumbers (watch the forecast)
October
- October 28 to November 4: 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 Northglenn (station USC00055984), 3 miles from the center of Westminster. 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/westminster/