Frost Dates for 99556 — Anchor Point, Alaska

Half of springs at Homer 8 NW, AK see their last 32°F night by May 16; only one in ten is past it by May 1, and one in ten still has one after May 30. Planting tender crops after May 22 leaves a 30% risk of a frost on them, after May 26 20%, and after May 30 10%. The 14 days between the even-odds date and the one-in-ten date is wider than at 57% of the 37 Alaska stations behind this site's ZIP pages.

In fall the first 32°F night comes by September 30 in half of years, as early as September 16 one year in ten, and holds off past October 14 one year in ten. A hard freeze of 28°F follows 11 days later, around October 11; in spring the one-in-ten date for 28°F is May 12, 18 days before the 32°F one. The freeze-free season lasts 136 days in a typical year, shorter than at 51% of the 37 Alaska stations; it reaches 158 days one year in ten and falls short of 115 one year in ten. On average 189 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 18 days longer, to about June 3, and return around September 17. Severe cold of 16°F or below comes every winter, usually between November 11 and March 30.

July is the warmest month at Homer 8 NW, AK, averaging 61°F by day and 47°F at night; January is the coldest at 28°F and 18°F. A freezing night is all but certain in every month from October to April (a 90% chance or more). From June to August the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 90% of years.

Warmth for growing adds up to 312 growing degree days a year (base 50°F), fewer than at 95% of the 37 Alaska stations. 22% of them (68) have built up by the end of June, and July adds the most, 126. Precipitation totals 29.7 inches a year, most in September (4.6") and least in March (1.2"); May to September bring 44% of it.

The nearest other station, Homer Airport, AK, 14 miles southeast of Anchor Point and 1,016 feet lower, has a last frost 6 days earlier (May 10), a first frost 1 day earlier (September 29), a season 5 days longer.

The first measurable snow (0.1 inch or more) in Anchor Point usually arrives around October 14, and the last of the season around April 28. Those are the middle dates across the winters of 1991–2020 at Homer 8 NW, AK, 5.1 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 18 days after the last snow.

ZIP 99556 is 5 miles from Homer 8 NW, AK, which stands at 1,080 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 99556 in zone 6a, the band where the coldest night of the year averaged -10 to -5°F (-23.3 to -20.6°C) over 1991–2020; a zone describes winter lows, not frost dates.