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 68105
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 68105 in zone 6a (the coldest night of a typical year: -10 to -5°F).
The nearest station, Omaha, NE, is 6 miles from the ZIP's center: its last spring frost comes after April 18 in half of years and after April 30 in one year in ten. By the USDA's method its plant hardiness zone is 5b.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Omaha, NEOmaha Eppley Airfield | 6 mi | 982 ft | April 18 | April 30 | October 21 | 5b |
| Omaha #1, NE | 8 mi | 1,280 ft | April 16 | May 6 | October 18 | – |
| Springfield, NE7 mi E | 13 mi | 1,065 ft | April 17 | May 1 | October 19 | – |
| Gretna, NE4 mi NE | 13 mi | 1,240 ft | April 21 | May 4 | October 18 | 6a |
| Fort Calhoun, NE4 mi W | 16 mi | 1,310 ft | April 19 | May 6 | October 17 | – |
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 Omaha
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 11 | May 3 | April 28 | April 14 | October 10 | September 27 |
| 32°F | April 30 | April 23 | April 18 | April 5 | October 21 | October 6 |
| 28°F (hard freeze) | April 21 | April 14 | April 8 | March 24 | October 30 | October 17 |
| 24°F | April 13 | April 4 | March 31 | March 13 | November 7 | October 26 |
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.