Last Frost Date

Planting planner: New Haven, Connecticut

Typical last spring frost April 17 (1 spring in 10 later than May 1). Typical first fall frost October 27 (1 fall in 10 earlier than October 11). Growing season about 193 days.

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Frost likely Frost possible Frost unlikely Frost is likely until April 2 and fades out by May 1. It is unlikely from then until October 11, and likely again after November 8. The dashed lines are the typical dates, April 17 and October 27.

January

  • January 30 to February 27: Broccoli and cabbage (start seeds indoors)

February

  • February 13 to March 13: Cauliflower (start seeds indoors)
  • February 27 to March 20: Eggplant (start seeds indoors)

March

  • March 6 to 20: Peppers (start seeds indoors)
  • March 13 to 27: Tomatoes (start seeds indoors)
  • March 20 to April 3: Peas, spinach, lettuce, radishes, onion sets, turnips (sow outdoors)
  • March 20 to April 3: Broccoli and cabbage (plant out)

April

  • April 3 to 17: Beets, carrots, potatoes, Swiss chard (plant outdoors)
  • April 3 to 17: Cauliflower (plant out)
  • April 17: Snap beans, sweet corn, cucumbers, summer squash (sow outdoors)

May

  • May 1: Tomatoes, peppers, eggplant (plant out)
  • May 1: Melons, winter squash, pumpkins, lima beans (sow outdoors)

June

  • June 1 to 15: Cabbage for fall (start seeds)
  • June 21 to July 5: Broccoli for fall (start seeds)

July

  • July 31: Snap beans for fall (last date to sow)

August

  • August 4: Carrots for fall (last date to sow)
  • August 5: Cucumbers for fall (last date to sow)
  • August 9: Peas for fall (last date to sow)
  • August 10: Summer squash for fall (last date to sow)
  • August 14: Leaf lettuce and beets for fall (last date to sow)
  • August 24: Turnips and kohlrabi for fall (last date to sow)

September

  • September 3: Spinach for fall (last date to sow)
  • September 13: Radishes for fall (last date to sow)

October

  • October 11: Tomatoes, peppers, squash, melons, cucumbers (watch the forecast)

November

  • November 13 to 20: Garlic (plant cloves)

December

Nothing to start this month.

Dates from NOAA's 1991 to 2020 climate normals for New Haven Tweed Airport (station USW00014758), 4 miles from the center of New Haven. 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/connecticut/new-haven/

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