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When to plant sunflowers in zone 8b

In zone 8b, where the last spring frost typically comes around March 17, sow outdoors March 17 to April 7.

The zone 8b schedule for sunflowers

Sow outdoors
March 17 to April 7
Safest planting date (10% frost risk)
April 6
First harvest, roughly
May 6 to July 6

From the median frost dates of the NOAA stations assigned to the 2,613 ZIP codes in zone 8b, and the timing recommended by Cooperative Extension guides for sunflowers.

Frost risk in zone 8b

Zones are based on winter cold, not on frost dates, so the last spring frost varies a lot within a zone. Across zone 8b, the typical last frost ranges from about March 5 in the earliest tenth of ZIP codes to April 3 in the latest tenth, and the first fall frost from November 2 to November 24. For a typical place in the zone:

  • February 25Risky: a later frost happens in 9 years out of 10
  • March 17Typical: frost after this date in half of years
  • April 6Safe: a later frost only 1 year in 10

Sunflowers 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 sunflowers

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

Sunflowers in zone 8b cities

CityTypical last frostPlantFall
San Antonio, TXFeb 26Feb 26 to Mar 19—
Dallas, TXMar 2Mar 2 to 23—
Fort Worth, TXMar 11Mar 11 to Apr 1—
El Paso, TXMar 2Mar 2 to 23—
Las Vegas, NVJan 20Jan 21 to Feb 11—
Virginia Beach, VAMar 29Mar 29 to Apr 19—
Arlington, TXMar 9Mar 9 to 30—
Plano, TXMar 7Mar 7 to 28—
Irving, TXMar 2Mar 2 to 23—
Garland, TXMar 7Mar 7 to 28—
Frisco, TXMar 18Mar 18 to Apr 8—
McKinney, TXMar 18Mar 18 to Apr 8—

How to grow sunflowersAll zonesSunflowers in zone 8aSunflowers in zone 9aAbout zone 8b

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