Last Frost Date

Planting planner: Gillette, Wyoming

Typical last spring frost May 22 (1 spring in 10 later than June 4). Typical first fall frost September 25 (1 fall in 10 earlier than September 9). Growing season about 125 days.

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Frost likely Frost possible Frost unlikely Frost is likely until May 8 and fades out by June 4. It is unlikely from then until September 9, and likely again after October 8. The dashed lines are the typical dates, May 22 and September 25.

Your season is too short for a separate fall planting of cabbage and broccoli: 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

Nothing to start this month.

March

  • March 6 to April 3: Broccoli and cabbage (start seeds indoors)
  • March 20 to April 17: Cauliflower (start seeds indoors)

April

  • April 3 to 24: Eggplant (start seeds indoors)
  • April 10 to 24: Peppers (start seeds indoors)
  • April 17 to May 1: Tomatoes (start seeds indoors)
  • April 24 to May 8: Peas, spinach, lettuce, radishes, onion sets, turnips (sow outdoors)
  • April 24 to May 8: Broccoli and cabbage (plant out)

May

  • May 8 to 22: Beets, carrots, potatoes, Swiss chard (plant outdoors)
  • May 8 to 22: Cauliflower (plant out)
  • May 22: Snap beans, sweet corn, cucumbers, summer squash (sow outdoors)

June

  • June 5: Tomatoes, peppers, eggplant (plant out)
  • June 5: Melons, winter squash, pumpkins, lima beans (sow outdoors)
  • June 29: Snap beans for fall (last date to sow)

July

  • July 3: Carrots for fall (last date to sow)
  • July 4: Cucumbers for fall (last date to sow)
  • July 8: Peas for fall (last date to sow)
  • July 9: Summer squash for fall (last date to sow)
  • July 13: Leaf lettuce and beets for fall (last date to sow)
  • July 23: Turnips and kohlrabi for fall (last date to sow)

August

  • August 2: Spinach for fall (last date to sow)
  • August 12: Radishes for fall (last date to sow)

September

  • September 9: Tomatoes, peppers, squash, melons, cucumbers (watch the forecast)

October

  • October 11 to 18: 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 Gillette Campbell Airport (station USW00094023), 5 miles from the center of Gillette. 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/wyoming/gillette/

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