Frost dates by ZIP code: The nearest NOAA stations to your ZIP, 1991-2020 normals
Enter a five-digit ZIP code. PlainClimate finds its center (Census Bureau 2024) and the five nearest NOAA stations with frost dates, and shows each station's last spring and first autumn 32°F dates with its distance and elevation.
Frost dates near ZIP 73012
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 73012 in zone 7b (the coldest night of a typical year: 5 to 10°F).
The nearest station, Oklahoma City Post Airport, OK, is 10 miles from the ZIP's center: its last spring frost comes after April 2 in half of years and after April 18 in one year in ten. By the USDA's method its plant hardiness zone is 7b.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Oklahoma City Post Airport, OK | 10 mi | 1,297 ft | April 2 | April 18 | November 4 | 7b |
| Guthrie 4 mi WSW Mesonet, OK | 14 mi | 1,082 ft | April 3 | April 20 | November 4 | – |
| Guthrie (5 mi S), OK | 15 mi | 1,110 ft | April 10 | April 30 | October 28 | 7a |
| Guthrie, OKGuthrie Municipal Airport | 16 mi | 1,068 ft | April 3 | April 20 | November 1 | 7b |
| Spencer, OKSpencer 2 mi ENE Mesonet | 17 mi | 1,223 ft | April 2 | April 18 | November 5 | – |
Frost comes later in spring at higher and colder stations and earlier in low, open ground: prefer a station at a similar elevation to yours. Hardiness zone in the table: the USDA's rule (the average of each year's coldest night, 1991-2020) applied to the station's own record.
Every frost threshold at Oklahoma City Post Airport
NOAA publishes the dates for several temperatures and odds. A 30% spring date means a 3-in-10 chance of a later frost (the convention almanacs use); 50% is the median; 10% the cautious date.
| Threshold | Spring, 10% | Spring, 30% | Spring, 50% | Spring, 90% | Autumn, 50% | Autumn, 10% |
|---|---|---|---|---|---|---|
| 36°F (light frost) | April 29 | April 19 | April 13 | March 30 | October 27 | October 14 |
| 32°F | April 18 | April 8 | April 2 | March 14 | November 4 | October 21 |
| 28°F (hard freeze) | April 5 | March 28 | March 19 | February 28 | November 13 | October 31 |
| 24°F | March 27 | March 15 | March 8 | February 19 | November 24 | November 5 |
Source: NOAA NCEI 1991-2020 annual normals; ZIP centers: Census Bureau 2024 Gazetteer; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. Autumn 10%: one year in ten has its first frost before this date.