Frost Dates for 65613 — Bolivar, Missouri

Half of springs at Bolivar 1 NE, MO see their last 32°F night by April 14; only one in ten is past it by March 29, and one in ten still has one after May 2. Planting tender crops after April 21 leaves a 30% risk of a frost on them, after April 26 20%, and after May 2 10%. The 18 days between the even-odds date and the one-in-ten date is wider than at 82% of the 158 Missouri stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 23 in half of years, as early as October 8 one year in ten, and holds off past November 4 one year in ten. A hard freeze of 28°F follows 9 days later, around November 1; in spring the one-in-ten date for 28°F is April 18, 14 days before the 32°F one. The freeze-free season lasts 188 days in a typical year, shorter than at 70% of the 158 Missouri stations; it reaches 211 days one year in ten and falls short of 166 one year in ten. On average 108 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 13 days longer, to about April 27, and return around October 13. Severe cold of 16°F or below comes every winter, usually between December 4 and March 1.

July is the warmest month at Bolivar 1 NE, MO, averaging 89°F by day and 67°F at night; January is the coldest at 43°F and 22°F. A freezing night is all but certain in every month from November to March (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 82% of years and May still brings one in 14% of years.

Warmth for growing adds up to 4,114 growing degree days a year (base 50°F), more than at 59% of the 158 Missouri stations. 37% of them (1,505) have built up by the end of June, and July adds the most, 869. Precipitation totals 46.5 inches a year, most in May (5.9") and least in January (2.3"); May to September bring 50% of it.

The nearest other station, Buffalo 2N, MO, 16 miles east of Bolivar, has a last frost 9 days later (April 23), a first frost 8 days earlier (October 15), a season 13 days shorter.

The first measurable snow (0.1 inch or more) in Bolivar usually arrives around December 8, and the last of the season around February 25. Those are the middle dates across the winters of 1991–2020 at Buffalo 2N, MO, 16.4 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 65613 is under a mile from Bolivar 1 NE, MO, which stands at 987 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 2 other ZIP codes share the station. The 2023 USDA Plant Hardiness Zone Map lists ZIP 65613 in zone 6b, the band where the coldest night of the year averaged -5 to 0°F (-20.6 to -17.8°C) over 1991–2020; a zone describes winter lows, not frost dates.