Frost Dates for 46989 — Upland, Indiana

Half of springs at Hartford City 4 ESE, IN see their last 32°F night by April 22; only one in ten is past it by April 6, and one in ten still has one after May 7. Planting tender crops after April 28 leaves a 30% risk of a frost on them, after May 2 20%, and after May 7 10%. The 15 days between the even-odds date and the one-in-ten date is narrower than at 70% of the 125 Indiana stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 22 in half of years, as early as October 7 one year in ten, and holds off past November 3 one year in ten. A hard freeze of 28°F follows 10 days later, around November 1; in spring the one-in-ten date for 28°F is April 27, 10 days before the 32°F one. The freeze-free season lasts 181 days in a typical year, shorter than at 50% of the 125 Indiana stations; it reaches 201 days one year in ten and falls short of 161 one year in ten. On average 117 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 10 days longer, to about May 2, and return around October 11. Severe cold of 16°F or below comes every winter, usually between December 4 and March 11.

July is the warmest month at Hartford City 4 ESE, IN, averaging 83°F by day and 64°F at night; January is the coldest at 33°F and 19°F. A freezing night is all but certain in every month from November to April (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 24% of years.

Warmth for growing adds up to 3,290 growing degree days a year (base 50°F), fewer than at 55% of the 125 Indiana stations. 36% of them (1,185) have built up by the end of June, and July adds the most, 732. Precipitation totals 41.8 inches a year, most in June (4.4") and least in February (2.4"); May to September bring 49% of it.

The nearest other station, Marion 2 N, IN, 12 miles northwest of Upland, has a last frost 4 days later (April 26), a first frost 2 days earlier (October 20), a season 6 days shorter.

The first measurable snow (0.1 inch or more) in Upland usually arrives around November 22, and the last of the season around March 31. Those are the middle dates across the winters of 1991–2020 at Hartford City 4 ESE, IN, 10.7 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 22 days after the last snow.

ZIP 46989 is 11 miles from Hartford City 4 ESE, IN, which stands at 924 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 4 other ZIP codes share the station; its figures are presented in full for 47348 (Hartford City). The 2023 USDA Plant Hardiness Zone Map lists ZIP 46989 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.