Planting planner: Grand Forks, North Dakota
Typical last spring frost May 16 (1 spring in 10 later than May 31). Typical first fall frost September 27 (1 fall in 10 earlier than September 15). Growing season about 133 days.
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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
- February 28 to March 28: Broccoli and cabbage (start seeds indoors)
March
- March 14 to April 11: Cauliflower (start seeds indoors)
- March 28 to April 18: Eggplant (start seeds indoors)
April
- April 4 to 18: Peppers (start seeds indoors)
- April 11 to 25: Tomatoes (start seeds indoors)
- April 18 to May 2: Peas, spinach, lettuce, radishes, onion sets, turnips (sow outdoors)
- April 18 to May 2: Broccoli and cabbage (plant out)
May
- May 2 to 16: Beets, carrots, potatoes, Swiss chard (plant outdoors)
- May 2 to 16: Cauliflower (plant out)
- May 16: Snap beans, sweet corn, cucumbers, summer squash (sow outdoors)
- May 30: Tomatoes, peppers, eggplant (plant out)
- May 30: Melons, winter squash, pumpkins, lima beans (sow outdoors)
June
Nothing to start this month.
July
- July 1: Snap beans for fall (last date to sow)
- July 5: Carrots for fall (last date to sow)
- July 6: Cucumbers for fall (last date to sow)
- July 10: Peas for fall (last date to sow)
- July 11: Summer squash for fall (last date to sow)
- July 15: Leaf lettuce and beets for fall (last date to sow)
- July 25: Turnips and kohlrabi for fall (last date to sow)
August
- August 4: Spinach for fall (last date to sow)
- August 14: Radishes for fall (last date to sow)
September
- September 15: Tomatoes, peppers, squash, melons, cucumbers (watch the forecast)
October
- October 12 to 19: 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 Grand Forks International Airport (station USW00014916), 5 miles from the center of Grand Forks. 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/north-dakota/grand-forks/