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 74075
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 74075 in zone 7a (the coldest night of a typical year: 0 to 5°F).
The nearest station, Stillwater, OK, is 1 miles from the ZIP's center: its last spring frost comes after April 3 in half of years and after April 21 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 |
|---|---|---|---|---|---|---|
| Stillwater, OKStillwater Regional Airport | 1 mi | 984 ft | April 3 | April 21 | October 31 | 7a |
| Stillwater (5 mi WNW), OK | 3 mi | 888 ft | April 12 | April 27 | October 27 | – |
| Stillwater Mesonet, OK | 3 mi | 892 ft | April 6 | April 21 | October 31 | – |
| Stillwater (2 mi W), OK | 4 mi | 890 ft | April 5 | April 21 | October 30 | 7a |
| Stillwater (2 mi W), OK | 4 mi | 895 ft | April 8 | April 25 | October 27 | – |
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 Stillwater
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 23 | April 16 | March 31 | October 22 | October 6 |
| 32°F | April 21 | April 10 | April 3 | March 18 | October 31 | October 15 |
| 28°F (hard freeze) | April 8 | March 31 | March 23 | March 4 | November 8 | October 24 |
| 24°F | March 30 | March 17 | March 11 | February 23 | November 20 | November 1 |
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.