Growing Calendar

MenuClose

HomeAboutSearch

When to plant sweet corn in zone 9b

In zone 9b, where the last spring frost typically comes around January 31, sow outdoors January 31 to February 14.

The zone 9b schedule for sweet corn

Sow outdoors
January 31 to February 14
Safest planting date (10% frost risk)
March 1
First harvest, roughly
April 1 to May 25

From the median frost dates of the NOAA stations assigned to the 1,459 ZIP codes in zone 9b, and the timing recommended by Cooperative Extension guides for sweet corn.

Frost risk in zone 9b

Zones are based on winter cold, not on frost dates, so the last spring frost varies a lot within a zone. Across zone 9b, the typical last frost ranges from about January 12 in the earliest tenth of ZIP codes to March 1 in the latest tenth, and the first fall frost from January 8 to December 28. For a typical place in the zone:

  • December 18Risky: a later frost happens in 9 years out of 10
  • January 31Typical: frost after this date in half of years
  • March 1Safe: 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 9b cities

CityTypical last frostPlantFall
Houston, TXJan 30Jan 30 to Feb 13Sep 21 to Oct 5
Jacksonville, FLFeb 1Feb 1 to 15Sep 29 to Oct 13
San Jose, CAJan 12Jan 12 to 26Sep 15 to 29
Fresno, CAJan 14Feb 3 to 17Sep 7 to 21
Sacramento, CAJan 12Jan 28 to Feb 11Sep 9 to 23
Bakersfield, CAJan 17Jan 23 to Feb 6Sep 8 to 22
New Orleans, LAJan 24Jan 24 to Feb 7Sep 26 to Oct 10
Henderson, NVJan 20Jan 21 to Feb 4Sep 8 to 22

How to grow sweet cornAll zonesSweet Corn in zone 9aAbout zone 9b

Sources