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 73505
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 73505 in zone 7b (the coldest night of a typical year: 5 to 10°F).
The nearest station, Lawton station, OK, is 3 miles from the ZIP's center: its last spring frost comes after March 26 in half of years and after April 14 in one year in ten.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Lawton station, OK | 3 mi | 1,150 ft | March 26 | April 14 | November 7 | – |
| Lawton, OKLawton Municipal Airport | 4 mi | 1,069 ft | April 1 | April 19 | November 5 | 7b |
| Medicine Park 3 mi W Mesonet, OK | 12 mi | 1,597 ft | March 21 | April 8 | November 12 | – |
| Chattanooga, OK | 14 mi | 1,148 ft | April 7 | April 24 | November 2 | – |
| Walters, OKWalters 4 mi NW Mesonet | 14 mi | 1,063 ft | March 26 | April 15 | November 6 | – |
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 Lawton station
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 24 | April 14 | April 7 | March 20 | October 29 | October 16 |
| 32°F | April 14 | April 3 | March 26 | March 4 | November 7 | October 21 |
| 28°F (hard freeze) | April 3 | March 19 | March 11 | February 22 | November 16 | October 30 |
| 24°F | March 19 | March 7 | February 28 | February 8 | November 30 | November 9 |
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.