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 06810
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 06810 in zone 6b (the coldest night of a typical year: -5 to 0°F).
The nearest station, Danbury, CT, is 1 miles from the ZIP's center: its last spring frost comes after May 1 in half of years and after May 16 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 |
|---|---|---|---|---|---|---|
| Danbury, CTDanbury Municipal Airport | 1 mi | 457 ft | May 1 | May 16 | October 14 | 6b |
| Danbury station, CT | 2 mi | 405 ft | April 20 | May 6 | October 20 | 6b |
| Carmel, NY4 mi N | 12 mi | 680 ft | April 28 | May 14 | October 16 | 6b |
| Stormville, NY | 18 mi | 915 ft | April 21 | May 4 | October 25 | – |
| Stamford, CT5 mi N | 18 mi | 190 ft | April 17 | May 2 | October 23 | 6b |
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 Danbury
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 27 | May 19 | May 12 | April 30 | October 2 | September 21 |
| 32°F | May 16 | May 6 | May 1 | April 18 | October 14 | October 1 |
| 28°F (hard freeze) | May 4 | April 24 | April 18 | April 3 | October 27 | October 11 |
| 24°F | April 19 | April 9 | April 3 | March 21 | November 6 | October 24 |
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.