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When to plant sweet corn in zone 3a

In zone 3a, where the last spring frost typically comes around May 26, sow outdoors May 26 to June 9.

The zone 3a schedule for sweet corn

Sow outdoors
May 26 to June 9
Safest planting date (10% frost risk)
June 11
First harvest, roughly
July 25 to September 17

From the median frost dates of the NOAA stations assigned to the 8 ZIP codes in zone 3a, and the timing recommended by Cooperative Extension guides for sweet corn.

Frost risk in zone 3a

Zones are based on winter cold, not on frost dates, so the last spring frost varies a lot within a zone. Across zone 3a, the typical last frost ranges from about May 10 in the earliest tenth of ZIP codes to June 2 in the latest tenth, and the first fall frost from September 12 to October 1. For a typical place in the zone:

  • May 10Risky: a later frost happens in 9 years out of 10
  • May 26Typical: frost after this date in half of years
  • June 11Safe: a later frost only 1 year in 10

Sweet Corn are killed by frost, so if you want to be safe, plant out after the safe date rather than the typical one, or be ready to cover plants on a cold night.

Your dates for sweet corn

Set your ZIP code at the top of the page and we will work out when to plant sweet corn 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

How to grow sweet cornAll zonesSweet Corn in zone 2aSweet Corn in zone 3bAbout zone 3a

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