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 73703
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 73703 in zone 7a (the coldest night of a typical year: 0 to 5°F).
The nearest station, Enid, OK, is 5 miles from the ZIP's center: its last spring frost comes after April 6 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 |
|---|---|---|---|---|---|---|
| Enid, OK | 5 mi | 1,245 ft | April 6 | April 21 | November 1 | 7a |
| Lahoma, OKLahoma 1 mi WSW Mesonet | 9 mi | 1,299 ft | April 10 | April 25 | October 31 | – |
| Breckinridge 3 mi SE Mesonet, OK | 15 mi | 1,154 ft | April 10 | April 25 | October 29 | – |
| Helena, OK1 mi SSE | 18 mi | 1,350 ft | April 9 | April 23 | October 31 | 7a |
| Jefferson, OK3 mi SE | 21 mi | 1,043 ft | April 18 | May 2 | October 20 | 7a |
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 Enid
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 30 | April 23 | April 16 | April 2 | October 24 | October 10 |
| 32°F | April 21 | April 12 | April 6 | March 20 | November 1 | October 21 |
| 28°F (hard freeze) | April 12 | April 3 | March 26 | March 5 | November 10 | October 26 |
| 24°F | April 1 | March 20 | March 10 | February 24 | November 20 | November 2 |
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.