Frost Dates for 73448 — Marietta, Oklahoma

Half of springs at Marietta 5SW, OK see their last 32°F night by April 6; only one in ten is past it by March 16, and one in ten still has one after April 24. Planting tender crops after April 13 leaves a 30% risk of a frost on them, after April 18 20%, and after April 24 10%. The 18 days between the even-odds date and the one-in-ten date is wider than at 60% of the 114 Oklahoma stations behind this site's ZIP pages.

In fall the first 32°F night comes by November 2 in half of years, as early as October 18 one year in ten, and holds off past November 16 one year in ten. A hard freeze of 28°F follows 7 days later, around November 9; in spring the one-in-ten date for 28°F is April 11, 13 days before the 32°F one. The freeze-free season lasts 211 days in a typical year, longer than at 51% of the 114 Oklahoma stations; it reaches 234 days one year in ten and falls short of 186 one year in ten. On average 70 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 11 days longer, to about April 17, and return around October 23. Severe cold of 16°F or below comes in 95% of winters, usually between December 20 and February 6.

July is the warmest month at Marietta 5SW, OK, averaging 94°F by day and 70°F at night; January is the coldest at 53°F and 28°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 65% of years.

Warmth for growing adds up to 5,277 growing degree days a year (base 50°F), more than at 68% of the 114 Oklahoma stations. 38% of them (2,012) have built up by the end of June, and July adds the most, 989. Precipitation totals 40.0 inches a year, most in May (5.6") and least in January (2.0"); May to September bring 48% of it.

The nearest other station, Burneyville 2SE Mesont, OK, 10 miles west of Marietta, has a last frost 6 days earlier (March 31), a first frost 2 days later (November 4), a season 7 days longer.

The first measurable snow (0.1 inch or more) in Marietta usually arrives around January 8, and the last of the season around January 23. Those are the middle dates across the winters of 1991–2020 at Marietta 5SW, OK, 5.4 miles away: half of years saw snow earlier, half later. Snow fell in 74% of those winters. The last 32°F night of spring typically comes 73 days after the last snow.

ZIP 73448 is 5 miles from Marietta 5SW, OK, which stands at 802 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 73448 in zone 8a, the band where the coldest night of the year averaged 10 to 15°F (-12.2 to -9.4°C) over 1991–2020; a zone describes winter lows, not frost dates.