Frost Dates for 04757 — Mapleton, Maine

Half of springs at Presque Isle, ME see their last 32°F night by May 14; only one in ten is past it by April 30, and one in ten still has one after June 1. Planting tender crops after May 22 leaves a 30% risk of a frost on them, after May 26 20%, and after June 1 10%. The 18 days between the even-odds date and the one-in-ten date is the widest of the 52 Maine stations behind this site's ZIP pages.

In fall the first 32°F night comes by September 26 in half of years, as early as September 10 one year in ten, and holds off past October 9 one year in ten. A hard freeze of 28°F follows 10 days later, around October 6; in spring the one-in-ten date for 28°F is May 16, 16 days before the 32°F one. The freeze-free season lasts 131 days in a typical year, shorter than at 90% of the 52 Maine stations; it reaches 152 days one year in ten and falls short of 108 one year in ten. On average 176 nights a year drop to 32°F or below. Nights of 36°F, when frost can still settle on leaves in low, open spots, continue 17 days longer, to about May 31, and return around September 15. Severe cold of 16°F or below comes every winter, usually between November 15 and April 4.

July is the warmest month at Presque Isle, ME, averaging 79°F by day and 56°F at night; January is the coldest at 22°F and 3°F. A freezing night is all but certain in every month from October to April (a 90% chance or more). From July to August the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 85% of years and June still brings one in 12% of years.

Warmth for growing adds up to 1,876 growing degree days a year (base 50°F), fewer than at 73% of the 52 Maine stations. 28% of them (532) have built up by the end of June, and July adds the most, 539. Precipitation totals 38.2 inches a year, most in October (4.2") and least in February (1.9"); May to September bring 47% of it.

The nearest other station, Caribou Municipal Airport, ME, 14 miles northeast of Mapleton, has a last frost 7 days earlier (May 7), a first frost 5 days later (October 1), a season 12 days longer.

The first measurable snow (0.1 inch or more) in Mapleton usually arrives around November 9, and the last of the season around April 14. Those are the middle dates across the winters of 1991–2020 at Presque Isle, ME, 6.9 miles away: half of years saw snow earlier, half later. Every one of those winters saw snow. The last 32°F night of spring typically comes 30 days after the last snow.

ZIP 04757 is 7 miles from Presque Isle, ME, which stands at 599 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station; its figures are presented in full for 04769 (Presque Isle). The 2023 USDA Plant Hardiness Zone Map lists ZIP 04757 in zone 4a, the band where the coldest night of the year averaged -30 to -25°F (-34.4 to -31.7°C) over 1991–2020; a zone describes winter lows, not frost dates.