Frost dates in Oklahoma

Across Oklahoma's 193 NOAA stations with a frost every year, the typical last spring frost ranges from March 15 at Ardmore (840 feet above sea level) to April 26 at Boise City 2 E (4,130 feet above sea level). The middle station's date is April 5.

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Last frost across Oklahoma

The frost-free season runs from 173 days at Boise City 2 E to 244 days at Hugo.

The station with the latest frost sits about 3,300 feet higher than the one with the earliest.

These are typical dates: in half of springs the last frost comes later. Each place's page, and each ZIP code lookup, also gives the late-year date, after which only 1 spring in 10 has a frost. That's the safer date for tender plants.

Frost dates for Oklahoma's larger places

Typical (1-in-2) dates. Each place's page has the early and late years, a planting calendar and a printable planner. Zones are for the ZIP code nearest each place's center.

Hardiness zones in Oklahoma

Oklahoma's 760 ZIP codes in the USDA list fall in zones 6b to 8a: 6b (2 percent), 7a (24 percent), 7b (61 percent) and 8a (14 percent). Compared with the 2012 map, 68 percent of them moved to a warmer half zone (1 by a full zone or more) and 32 percent stayed the same.

A hardiness zone is about the coldest night of winter, which decides which shrubs, trees and perennials survive. Frost dates are about spring and fall, which decide when to plant. You need both. Read more about what the zones mean and what changed in 2023.

Every NOAA station in Oklahoma

All 193 stations in Oklahoma with frost statistics in NOAA's 1991 to 2020 normals, from A to Z. Station names are usually a town, an airport, or a distance and direction from a town. Find one near you and at a similar elevation.

Typical (1-in-2) dates at 32°F. For the early and late years, and a planting calendar built from your own dates, look up your ZIP code.