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 05405
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 05405 in zone 5a (the coldest night of a typical year: -20 to -15°F).
The nearest station, Burlington, VT, is 2 miles from the ZIP's center: its last spring frost comes after April 29 in half of years and after May 11 in one year in ten. By the USDA's method its plant hardiness zone is 5a.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Burlington, VTBurlington International Airport | 2 mi | 330 ft | April 29 | May 11 | October 15 | 5a |
| Essex Junction, VT1 mi N | 5 mi | 340 ft | May 2 | May 17 | October 11 | 5a |
| Willsboro, NY1 mi N | 11 mi | 180 ft | May 2 | May 16 | October 14 | – |
| South Hero, VT | 12 mi | 110 ft | April 28 | May 10 | October 20 | 5b |
| Plattsburgh, NYPlattsburgh International Airport | 18 mi | 234 ft | May 6 | May 19 | October 5 | – |
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 Burlington
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 23 | May 14 | May 8 | April 27 | October 4 | September 23 |
| 32°F | May 11 | May 3 | April 29 | April 17 | October 15 | October 2 |
| 28°F (hard freeze) | April 30 | April 22 | April 18 | April 5 | October 28 | October 12 |
| 24°F | April 18 | April 12 | April 7 | March 27 | November 9 | 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.