Last Frost Date

Planting planner: Casper, Wyoming

Typical last spring frost May 26 (1 spring in 10 later than June 10). Typical first fall frost September 22 (1 fall in 10 earlier than September 5). Growing season about 117 days.

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Frost likely Frost possible Frost unlikely Frost is likely until May 12 and fades out by June 10. It is unlikely from then until September 5, and likely again after October 4. The dashed lines are the typical dates, May 26 and September 22.

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 10 to April 7: Broccoli and cabbage (start seeds indoors)
  • March 24 to April 21: Cauliflower (start seeds indoors)

April

  • April 7 to 28: Eggplant (start seeds indoors)
  • April 14 to 28: Peppers (start seeds indoors)
  • April 21 to May 5: Tomatoes (start seeds indoors)
  • April 28 to May 12: Peas, spinach, lettuce, radishes, onion sets, turnips (sow outdoors)
  • April 28 to May 12: Broccoli and cabbage (plant out)

May

  • May 12 to 26: Beets, carrots, potatoes, Swiss chard (plant outdoors)
  • May 12 to 26: Cauliflower (plant out)
  • May 26: Snap beans, sweet corn, cucumbers, summer squash (sow outdoors)

June

  • June 9: Tomatoes, peppers, eggplant (plant out)
  • June 9: Melons, winter squash, pumpkins, lima beans (sow outdoors)
  • June 26: Snap beans for fall (last date to sow)
  • June 30: Carrots for fall (last date to sow)

July

  • July 1: Cucumbers for fall (last date to sow)
  • July 5: Peas for fall (last date to sow)
  • July 6: Summer squash for fall (last date to sow)
  • July 10: Leaf lettuce and beets for fall (last date to sow)
  • July 20: Turnips and kohlrabi for fall (last date to sow)
  • July 30: Spinach for fall (last date to sow)

August

  • August 9: Radishes for fall (last date to sow)

September

  • September 5: Tomatoes, peppers, squash, melons, cucumbers (watch the forecast)

October

  • October 9 to 16: 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 Casper Natrona Co Airport (station USW00024089), 8 miles from the center of Casper. 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/casper/

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