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 73022
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 73022 in zone 7b (the coldest night of a typical year: 5 to 10°F).
The nearest station, El Reno, OK, is 5 miles from the ZIP's center: its last spring frost comes after April 6 in half of years and after April 22 in one year in ten.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| El Reno, OK1 mi N | 5 mi | 1,325 ft | April 6 | April 22 | October 31 | – |
| El Reno 5 WNW Mesonet, OK | 5 mi | 1,374 ft | April 12 | April 25 | October 27 | – |
| Kingfisher, OKKingfisher 1 mi W Mesonet | 17 mi | 1,059 ft | April 9 | April 25 | November 1 | – |
| Kingfisher station, OK | 17 mi | 1,050 ft | April 8 | April 24 | November 1 | 7b |
| Geary, OK | 19 mi | 1,571 ft | April 6 | April 23 | 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 El Reno
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 1 | April 24 | April 17 | April 1 | October 21 | October 3 |
| 32°F | April 22 | April 12 | April 6 | March 21 | October 31 | October 15 |
| 28°F (hard freeze) | April 11 | April 2 | March 26 | March 9 | November 7 | October 24 |
| 24°F | April 1 | March 23 | March 14 | February 27 | November 16 | 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.