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 62702
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 62702 in zone 6a (the coldest night of a typical year: -10 to -5°F).
The nearest station, Springfield, IL, is 3 miles from the ZIP's center: its last spring frost comes after April 14 in half of years and after April 29 in one year in ten. By the USDA's method its plant hardiness zone is 6a.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Springfield, ILSpringfield Abraham Lincoln Capital Airport | 3 mi | 594 ft | April 14 | April 29 | October 20 | 6a |
| Springfield #2, IL | 3 mi | 599 ft | April 15 | April 30 | October 22 | – |
| Athens, IL4 mi SW | 11 mi | 594 ft | April 19 | May 4 | October 19 | – |
| Petersburg, IL1 mi E | 17 mi | 600 ft | April 13 | April 28 | October 21 | – |
| Virden, IL | 23 mi | 675 ft | April 7 | April 21 | October 29 | 6a |
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 Springfield
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 10 | May 1 | April 25 | April 11 | October 9 | September 25 |
| 32°F | April 29 | April 20 | April 14 | April 1 | October 20 | October 5 |
| 28°F (hard freeze) | April 18 | April 9 | April 3 | March 17 | October 30 | October 16 |
| 24°F | April 7 | March 30 | March 23 | March 5 | November 8 | 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.