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 81506
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 81506 in zone 7a (the coldest night of a typical year: 0 to 5°F).
The nearest station, Grand Junction, CO, is 1 miles from the ZIP's center: its last spring frost comes after April 28 in half of years and after May 14 in one year in ten. By the USDA's method its plant hardiness zone is 6b.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Grand Junction, COGrand Junction Walker Field | 1 mi | 4,858 ft | April 28 | May 14 | October 16 | 6b |
| Grand Junction Weather Office, CO | 2 mi | 4,826 ft | April 14 | April 28 | October 23 | – |
| Grand Junction (6 mi ESE), CO | 8 mi | 4,760 ft | April 23 | May 9 | October 20 | 7a |
| Fruita, CO | 9 mi | 4,498 ft | April 27 | May 7 | October 11 | – |
| Colorado National Monument, CO | 10 mi | 5,781 ft | April 26 | May 15 | October 16 | 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 Grand Junction
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 25 | May 15 | May 8 | April 25 | October 6 | September 24 |
| 32°F | May 14 | May 3 | April 28 | April 11 | October 16 | October 3 |
| 28°F (hard freeze) | May 2 | April 21 | April 13 | March 24 | October 27 | October 12 |
| 24°F | April 21 | April 6 | March 28 | March 5 | November 7 | October 22 |
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.