Last Frost Date

Planting planner: Nampa, Idaho

Typical last spring frost April 29 (1 spring in 10 later than May 18). Typical first fall frost October 13 (1 fall in 10 earlier than September 29). Growing season about 164 days.

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Frost likely Frost possible Frost unlikely Frost is likely until April 15 and fades out by May 18. It is unlikely from then until September 29, and likely again after October 28. The dashed lines are the typical dates, April 29 and October 13.

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 11 to March 11: Broccoli and cabbage (start seeds indoors)
  • February 25 to March 25: Cauliflower (start seeds indoors)

March

  • March 11 to April 1: Eggplant (start seeds indoors)
  • March 18 to April 1: Peppers (start seeds indoors)
  • March 25 to April 8: Tomatoes (start seeds indoors)

April

  • April 1 to 15: Peas, spinach, lettuce, radishes, onion sets, turnips (sow outdoors)
  • April 1 to 15: Broccoli and cabbage (plant out)
  • April 15 to 29: Beets, carrots, potatoes, Swiss chard (plant outdoors)
  • April 15 to 29: Cauliflower (plant out)
  • April 29: Snap beans, sweet corn, cucumbers, summer squash (sow outdoors)

May

  • May 13: Tomatoes, peppers, eggplant (plant out)
  • May 13: Melons, winter squash, pumpkins, lima beans (sow outdoors)

June

  • June 7 to 21: Broccoli for fall (start seeds)

July

  • July 17: Snap beans for fall (last date to sow)
  • July 21: Carrots for fall (last date to sow)
  • July 22: Cucumbers for fall (last date to sow)
  • July 26: Peas for fall (last date to sow)
  • July 27: Summer squash for fall (last date to sow)
  • July 31: Leaf lettuce and beets for fall (last date to sow)

August

  • August 10: Turnips and kohlrabi for fall (last date to sow)
  • August 20: Spinach for fall (last date to sow)
  • August 30: Radishes for fall (last date to sow)

September

  • September 29: Tomatoes, peppers, squash, melons, cucumbers (watch the forecast)

October

Nothing to start this month.

November

  • November 1 to 8: Garlic (plant cloves)

December

Nothing to start this month.

Dates from NOAA's 1991 to 2020 climate normals for Nampa Sugar Factory (station USC00106305), 1 mile from the center of Nampa. 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/idaho/nampa/

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