Frost Dates for 46543 — Millersburg, Indiana

Half of springs at Goshen Municipal Airport, IN see their last 32°F night by April 28; only one in ten is past it by April 14, and one in ten still has one after May 13. Planting tender crops after May 3 leaves a 30% risk of a frost on them, after May 8 20%, and after May 13 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 19 in half of years, as early as October 4 one year in ten, and holds off past November 1 one year in ten. A hard freeze of 28°F follows 12 days later, around October 31; in spring the one-in-ten date for 28°F is May 2, 11 days before the 32°F one. The freeze-free season lasts 171 days in a typical year, shorter than at 84% of the 125 Indiana stations; it reaches 191 days one year in ten and falls short of 152 one year in ten. On average 130 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 9 days longer, to about May 7, and return around October 6. Severe cold of 16°F or below comes every winter, usually between December 2 and March 14.

July is the warmest month at Goshen Municipal Airport, IN, averaging 83°F by day and 62°F at night; January is the coldest at 32°F and 18°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 40% of years.

Warmth for growing adds up to 3,021 growing degree days a year (base 50°F), fewer than at 90% of the 125 Indiana stations. 35% of them (1,062) have built up by the end of June, and July adds the most, 705. Precipitation totals 34.7 inches a year, most in May (4.2") and least in February (1.6"); May to September bring 53% of it.

The nearest other station, Goshen 3SW, IN, 10 miles west of Millersburg, has a last frost 2 days earlier (April 26), a first frost 2 days later (October 21), a season 4 days longer.

The first measurable snow (0.1 inch or more) in Millersburg usually arrives around November 21, and the last of the season around April 6. Those are the middle dates across the winters of 1991–2020 at Goshen 3SW, IN, 10.5 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 46543 is 6 miles from Goshen Municipal Airport, IN, which stands at 827 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 46540 (Middlebury). The 2023 USDA Plant Hardiness Zone Map lists ZIP 46543 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.