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 02840
The USDA's 2023 Plant Hardiness Zone Map puts ZIP 02840 in zone 7a (the coldest night of a typical year: 0 to 5°F).
The nearest station, Newport Rose, RI, is 2 miles from the ZIP's center: its last spring frost comes after April 7 in half of years and after April 21 in one year in ten.
| Station | Distance | Elevation | Last frost (median) | 1 in 10 after | First frost (median) | Hardiness zone |
|---|---|---|---|---|---|---|
| Newport Rose, RI | 2 mi | 15 ft | April 7 | April 21 | November 13 | – |
| Newport, RINewport State Airport | 4 mi | 172 ft | April 11 | April 24 | November 4 | 7a |
| Kingston, RI1 mi W | 11 mi | 106 ft | May 1 | May 18 | October 12 | – |
| Kingston (1 mi NW), RI | 12 mi | 115 ft | April 27 | May 11 | October 15 | 6b |
| Kingston station, RI | 12 mi | 117 ft | May 3 | May 16 | October 8 | – |
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 Newport Rose
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 6 | April 29 | April 23 | April 10 | November 1 | October 17 |
| 32°F | April 21 | April 14 | April 7 | March 28 | November 13 | October 31 |
| 28°F (hard freeze) | April 8 | April 1 | March 28 | March 14 | November 25 | November 11 |
| 24°F | March 31 | March 23 | March 17 | March 3 | December 6 | November 21 |
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.