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 46902
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 46902 in zone 6a (the coldest night of a typical year: -10 to -5°F).
The nearest station, Kokomo, IN, is 5 miles from the ZIP's center: its last spring frost comes after April 27 in half of years and after May 13 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 |
|---|---|---|---|---|---|---|
| Kokomo, IN3 mi WSW | 5 mi | 822 ft | April 27 | May 13 | October 18 | 5b |
| Tipton, IN5 mi SW | 15 mi | 890 ft | April 23 | May 9 | October 17 | 6a |
| Young America, IN | 16 mi | 773 ft | April 25 | May 11 | October 17 | 5b |
| Elwood, IN | 17 mi | 866 ft | April 24 | May 10 | October 18 | – |
| Frankfort, INFrankfort Disposal | 24 mi | 824 ft | April 21 | May 7 | October 21 | 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 Kokomo
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 22 | May 12 | May 6 | April 23 | October 8 | September 24 |
| 32°F | May 13 | May 3 | April 27 | April 13 | October 18 | October 4 |
| 28°F (hard freeze) | May 1 | April 21 | April 15 | March 31 | October 29 | October 13 |
| 24°F | April 18 | April 9 | April 3 | March 19 | November 8 | October 27 |
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.