Frost Dates for 47424 — Bloomfield, Indiana

Half of springs at Crane Nsa, IN see their last 32°F night by April 9; only one in ten is past it by March 22, and one in ten still has one after April 29. Planting tender crops after April 17 leaves a 30% risk of a frost on them, after April 22 20%, and after April 29 10%. The 20 days between the even-odds date and the one-in-ten date is the widest of the 125 Indiana stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 31 in half of years, as early as October 15 one year in ten, and holds off past November 15 one year in ten. A hard freeze of 28°F follows 10 days later, around November 10; in spring the one-in-ten date for 28°F is April 14, 15 days before the 32°F one. The freeze-free season lasts 202 days in a typical year, longer than at 90% of the 125 Indiana stations; it reaches 227 days one year in ten and falls short of 181 one year in ten. On average 98 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 21, and return around October 21. Severe cold of 16°F or below comes every winter, usually between December 16 and February 25.

July is the warmest month at Crane Nsa, IN, averaging 87°F by day and 67°F at night; January is the coldest at 41°F and 23°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 71% of years.

Warmth for growing adds up to 4,113 growing degree days a year (base 50°F), more than at 89% of the 125 Indiana stations. 37% of them (1,530) have built up by the end of June, and July adds the most, 832.

The nearest other station, Elnora, IN, 15 miles southwest of Bloomfield and 250 feet lower, has the same 50% last-frost date, a first frost 6 days earlier (October 25), a season 5 days shorter.

The first measurable snow (0.1 inch or more) in Bloomfield usually arrives around December 15, and the last of the season around February 28. Those are the middle dates across the winters of 1991–2020 at Elliston, IN, 2 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 40 days after the last snow.

ZIP 47424 is 11 miles from Crane Nsa, IN, which stands at 730 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. The 2023 USDA Plant Hardiness Zone Map lists ZIP 47424 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.