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When to plant sweet corn in zone 9a

In zone 9a, where the last spring frost typically comes around March 2, sow outdoors March 2 to 16.

The zone 9a schedule for sweet corn

Sow outdoors
March 2 to 16
Safest planting date (10% frost risk)
March 25
First harvest, roughly
May 1 to June 24

From the median frost dates of the NOAA stations assigned to the 1,736 ZIP codes in zone 9a, and the timing recommended by Cooperative Extension guides for sweet corn.

Frost risk in zone 9a

Zones are based on winter cold, not on frost dates, so the last spring frost varies a lot within a zone. Across zone 9a, the typical last frost ranges from about February 13 in the earliest tenth of ZIP codes to March 21 in the latest tenth, and the first fall frost from November 14 to December 9. For a typical place in the zone:

  • February 4Risky: a later frost happens in 9 years out of 10
  • March 2Typical: frost after this date in half of years
  • March 25Safe: 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

Sweet Corn in zone 9a cities

CityTypical last frostPlantFall
Austin, TXFeb 20Feb 20 to Mar 6Aug 27 to Sep 10
Seattle, WAMar 8Apr 12 to 26Aug 17 to 31
Portland, ORMar 13Mar 29 to Apr 12Aug 13 to 27
Tucson, AZFeb 5Feb 5 to 19Sep 2 to 16
North Las Vegas, NVJan 20Jan 21 to Feb 4Sep 8 to 22
Baton Rouge, LAFeb 25Feb 25 to Mar 11Aug 20 to Sep 3
Tallahassee, FLMar 11Mar 11 to 25Aug 15 to 29
Mobile, ALFeb 21Feb 21 to Mar 7Aug 30 to Sep 13
Palmdale, CAMar 10Mar 10 to 24Aug 13 to 27
Charleston, SCFeb 4Feb 4 to 18Sep 23 to Oct 7
Savannah, GAMar 2Mar 2 to 16Aug 24 to Sep 7
Gainesville, FLMar 3Mar 3 to 17Aug 26 to Sep 9

How to grow sweet cornAll zonesSweet Corn in zone 8bSweet Corn in zone 9bAbout zone 9a

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