Frost Dates for 99615 — Kodiak, Alaska

Half of springs at Kodiak Airport, AK see their last 32°F night by May 5; only one in ten is past it by April 19, and one in ten still has one after May 21. Planting tender crops after May 12 leaves a 30% risk of a frost on them, after May 16 20%, and after May 21 10%. The 16 days between the even-odds date and the one-in-ten date is wider than at 81% of the 37 Alaska stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 3 in half of years, as early as September 22 one year in ten, and holds off past October 17 one year in ten. A hard freeze of 28°F follows 14 days later, around October 17; in spring the one-in-ten date for 28°F is May 3, 18 days before the 32°F one. The freeze-free season lasts 151 days in a typical year, longer than at 73% of the 37 Alaska stations; it reaches 171 days one year in ten and falls short of 131 one year in ten. On average 133 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 21 days longer, to about May 26, and return around September 21. Severe cold of 16°F or below comes every winter, usually between December 4 and March 9.

August is the warmest month at Kodiak Airport, AK, averaging 63°F by day and 50°F at night; January is the coldest at 36°F and 26°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 67% of years.

Warmth for growing adds up to 551 growing degree days a year (base 50°F), fewer than at 68% of the 37 Alaska stations. 16% of them (88) have built up by the end of June, and August adds the most, 204. Precipitation totals 78.5 inches a year, most in October (8.9") and least in July (4.5"); May to September bring 36% of it.

The first measurable snow (0.1 inch or more) in Kodiak usually arrives around October 29, and the last of the season around April 19. Those are the middle dates across the winters of 1991–2020 at Kodiak Airport, AK, 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 16 days after the last snow.

ZIP 99615 is 1 mile from Kodiak Airport, AK, which stands at 80 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 99615 in zone 7a, the band where the coldest night of the year averaged 0 to 5°F (-17.8 to -15.0°C) over 1991–2020; a zone describes winter lows, not frost dates.