Frost Dates for 74344 — Grove, Oklahoma

Half of springs at Anderson 3W, MO see their last 32°F night by April 15; only one in ten is past it by March 31, and one in ten still has one after April 30. Planting tender crops after April 21 leaves a 30% risk of a frost on them, after April 25 20%, and after April 30 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 86% of the 114 Oklahoma stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 26 in half of years, as early as October 14 one year in ten, and holds off past November 8 one year in ten. A hard freeze of 28°F follows 9 days later, around November 4; in spring the one-in-ten date for 28°F is April 19, 11 days before the 32°F one. The freeze-free season lasts 194 days in a typical year, shorter than at 95% of the 114 Oklahoma stations; it reaches 215 days one year in ten and falls short of 174 one year in ten. On average 100 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 12 days longer, to about April 27, and return around October 18. Severe cold of 16°F or below comes every winter, usually between December 4 and February 28.

July is the warmest month at Anderson 3W, MO, averaging 89°F by day and 68°F at night; January is the coldest at 46°F and 24°F. A freezing night is all but certain in every month from November to March (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 88% of years.

Warmth for growing adds up to 4,293 growing degree days a year (base 50°F), the fewest of the 114 Oklahoma stations. 36% of them (1,541) have built up by the end of June, and July adds the most, 888.

The nearest other station, Upper Spavinaw Port, OK, 18 miles south of Grove and 322 feet lower, has a last frost 1 day later (April 16), a first frost 6 days earlier (October 20), a season 7 days shorter.

The first measurable snow (0.1 inch or more) in Grove usually arrives around December 9, and the last of the season around February 26. Those are the middle dates across the winters of 1991–2020 at Anderson, MO, 18.5 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 48 days after the last snow.

ZIP 74344 is 16 miles from Anderson 3W, MO, which stands at 1,117 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 1 other ZIP code shares the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 74344 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.