Frost Dates for 46128 — Fillmore, Indiana

Half of springs at Greencastle 1 W, IN see their last 32°F night by April 27; only one in ten is past it by April 13, and one in ten still has one after May 15. Planting tender crops after May 3 leaves a 30% risk of a frost on them, after May 8 20%, and after May 15 10%. The 18 days between the even-odds date and the one-in-ten date is wider than at 84% of the 125 Indiana stations behind this site's ZIP pages.

In fall the first 32°F night comes by October 15 in half of years, as early as October 1 one year in ten, and holds off past October 26 one year in ten. A hard freeze of 28°F follows 11 days later, around October 26; in spring the one-in-ten date for 28°F is May 2, 13 days before the 32°F one. The freeze-free season lasts 169 days in a typical year, shorter than at 91% of the 125 Indiana stations; it reaches 188 days one year in ten and falls short of 149 one year in ten. On average 124 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 May 8, and return around October 4. Severe cold of 16°F or below comes every winter, usually between November 26 and March 11.

July is the warmest month at Greencastle 1 W, IN, averaging 83°F by day and 61°F at night; January is the coldest at 34°F and 17°F. A freezing night is all but certain in every month from October 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 38% of years.

Warmth for growing adds up to 3,059 growing degree days a year (base 50°F), fewer than at 81% of the 125 Indiana stations. 36% of them (1,088) have built up by the end of June, and July adds the most, 688. Precipitation totals 46.3 inches a year, most in June (5.4") and least in February (2.6"); May to September bring 48% of it.

The nearest other station, Jamestown 2 E, IN, 19 miles northeast of Fillmore and 227 feet higher, has a last frost 4 days earlier (April 23), a first frost 4 days later (October 19), a season 9 days longer.

The first measurable snow (0.1 inch or more) in Fillmore usually arrives around December 7, and the last of the season around March 8. Those are the middle dates across the winters of 1991–2020 at Greencastle 1 W, IN, 6.9 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 50 days after the last snow.

ZIP 46128 is 7 miles from Greencastle 1 W, IN, which stands at 735 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 3 other ZIP codes share the station; its figures are presented in full for 46135 (Greencastle). The 2023 USDA Plant Hardiness Zone Map lists ZIP 46128 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.