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When to plant carrots in zone 4b

In zone 4b, where the last spring frost typically comes around May 8, sow outdoors April 17 to May 8. For a fall crop, plant July 9 to 30.

The zone 4b schedule for carrots

Sow outdoors
April 17 to May 8
First harvest, roughly
June 16 to August 16
Plant for a fall crop
July 9 to 30

From the median frost dates of the NOAA stations assigned to the 1,164 ZIP codes in zone 4b, and the timing recommended by Cooperative Extension guides for carrots.

Dates before the last frost assume the soil has thawed and is dry enough to work: a squeezed handful crumbles instead of sticking. After a late or wet spring, wait for that even if the date has passed.

Frost risk in zone 4b

Zones are based on winter cold, not on frost dates, so the last spring frost varies a lot within a zone. Across zone 4b, the typical last frost ranges from about May 1 in the earliest tenth of ZIP codes to May 25 in the latest tenth, and the first fall frost from September 22 to October 8. For a typical place in the zone:

  • April 26Risky: a later frost happens in 9 years out of 10
  • May 8Typical: frost after this date in half of years
  • May 22Safe: a later frost only 1 year in 10

Your dates for carrots

Set your ZIP code at the top of the page and we will work out when to plant carrots where you live, from the frost records of the nearest NOAA weather station. Your ZIP code is remembered on this device only.

Enter your ZIP code

Carrots in zone 4b cities

CityTypical last frostPlantFall
Rochester, MNApr 30Apr 9 to 30Jul 14 to Aug 4
Duluth, MNMay 6Apr 15 to May 6Jul 17 to Aug 7
Lakeville, MNMay 2Apr 11 to May 2Jul 13 to Aug 3
St. Cloud, MNMay 7Apr 16 to May 7Jul 8 to 29
Eau Claire, WIMay 8Apr 17 to May 8Jul 12 to Aug 2
Great Falls, MTMay 19Apr 28 to May 19Jul 2 to 23

How to grow carrotsAll zonesCarrots in zone 4aCarrots in zone 5aAbout zone 4b

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