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 73003
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 73003 in zone 7b (the coldest night of a typical year: 5 to 10°F).
The nearest station, Guthrie (5 mi S), OK, is 12 miles from the ZIP's center: its last spring frost comes after April 10 in half of years and after April 30 in one year in ten. By the USDA's method its plant hardiness zone is 7a.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Guthrie (5 mi S), OK | 12 mi | 1,110 ft | April 10 | April 30 | October 28 | 7a |
| Spencer, OKSpencer 2 mi ENE Mesonet | 12 mi | 1,223 ft | April 2 | April 18 | November 5 | – |
| Guthrie 4 mi WSW Mesonet, OK | 12 mi | 1,082 ft | April 3 | April 20 | November 4 | – |
| Oklahoma City Post Airport, OK | 13 mi | 1,297 ft | April 2 | April 18 | November 4 | 7b |
| Guthrie, OKGuthrie Municipal Airport | 13 mi | 1,068 ft | April 3 | April 20 | November 1 | 7b |
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 Guthrie (5 mi S)
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) | May 7 | April 30 | April 22 | April 6 | October 19 | October 4 |
| 32°F | April 30 | April 18 | April 10 | March 24 | October 28 | October 14 |
| 28°F (hard freeze) | April 17 | April 6 | March 30 | March 11 | November 5 | October 23 |
| 24°F | April 5 | March 25 | March 17 | February 27 | November 14 | October 31 |
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.