U.S. Frost Dates by Weather Station

NOAA station USC00126830 · Indiana

Frost Dates for Perrysville, IN

NOAA weather station Perrysville 4 WNW (USC00126830), Indiana · elevation 611 ft (186 m) · hardiness zone 6a*

  • Lower-risk planting dateafter May 7only 1 spring in 10 still has a frost later
  • Typical last frostApril 2350% chance of a frost after it
  • Typical first fall frostOctober 1450% chance of a frost before it
  • Frost-free season171 daystypical year, 32°F
  • Hardiness zone6acalculated*

The year at a glance

Frost season at Perrysville, INSpring: a frost after April 10 in 9 years out of 10, after April 23 in half of the years, after May 7 in 1 year out of 10. Fall: the first frost comes before September 29 in 1 year out of 10, before October 14 in half of the years, before October 27 in 9 years out of 10. Typical frost-free season: 171 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 23First frost ~Oct 14Frost season at Perrysville, INSpring: a frost after April 10 in 9 years out of 10, after April 23 in half of the years, after May 7 in 1 year out of 10. Fall: the first frost comes before September 29 in 1 year out of 10, before October 14 in half of the years, before October 27 in 9 years out of 10. Typical frost-free season: 171 days.JFMAMJJASONDLast frost ~Apr 23First frost ~Oct 14
frost likely chance fading 90% → 10% frost-free in a typical yearThe year at a glance. Blue: frost is likely; the gradient fades as the chance drops from 90% to 10%; green: the frost-free part of a typical year.

Frost dates (32°F)

Probability of frost, based on 30 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)May 7September 29
50% (typical)April 23October 14
90% (likely)April 10October 27
Frost-free season (32°F, 50% chance)
171 days
Hard frost (28°F), last in spring, 50% chance after
April 13
Hard frost (28°F), first in fall, 50% chance before
October 24

The last 15 years (2006–2020 normals)

Typical last frost April 24 (1 day later than the 30-year normal), typical first fall frost October 17 (3 days later). Frost-free season 175 days.

A shorter, more recent NOAA period. The 30-year normals above remain the main reference: 15 years carry more year-to-year noise.

Add these dates to your calendar Yearly reminders for the typical last frost, the lower-risk planting date and the typical first fall frost (.ics).

How the chance of frost changes with the date

Spring at Perrysville: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 7, 20% May 2, 30% April 29, 40% April 26, 50% April 23, 60% April 21, 70% April 18, 80% April 15, 90% April 10. Observed last spring frost in recent years: 2021 April 23, 2022 April 20, 2023 April 27, 2024 April 26, 2025 April 13, 2026 April 21.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1May 7Apr 23Apr 102021: April 232022: April 202023: April 272024: April 262025: April 132026: April 21Fall at Perrysville: chance of a frost before this dateFall, chance of a frost before the date: 10% September 29, 20% October 4, 30% October 7, 40% October 11, 50% October 14, 60% October 16, 70% October 19, 80% October 23, 90% October 27. Observed first fall frost in recent years: 2021 November 3, 2022 October 8, 2023 October 31, 2024 October 17, 2025 October 24.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Sep 29Oct 14Oct 272021: November 32022: October 82023: October 312024: October 172025: October 24
Two charts, because spring and fall answer different questions: in spring, the chance that a frost still comes after a date; in fall, the chance that the first frost has already come before it. NOAA publishes these odds from 10% to 90%, so the lines stop there. ◆ marks the actual date in each recent year.

What actually happened in recent years

Observed dates of the last spring and first fall frost (32°F) at this station; ◆ marks them on the charts above
YearLast spring frostFirst fall frost
2021April 23November 3
2022April 20October 8
2023April 27October 31
2024April 26October 17
2025April 13October 24
2026April 21season not over yet

What these dates mean

The 171 days between the 50% dates in Perrysville—April 23 and October 14—enclose the period in which a light frost (32 °F) is equally likely to have occurred or not. These median dates are not frost dates themselves but mark the point of even odds for a light frost in spring and fall.

The cautious spring date for tender crops is May 7, when there is only a 10 % chance of a light frost later; planting before April 10 would be a gamble with a 90 % chance of frost. In fall, the cautious date to finish harvesting tender crops is September 29, with only a 10 % chance that a light frost has arrived earlier; extending to October 27 would be a gamble with a 90 % chance of frost.

A hard frost at 28 °F can cause far more damage than a light frost, and the median hard-frost dates of April 13 and October 24 show when that higher risk becomes even.

How to read the probabilities

The dates are probabilities from 30 years of weather, not a forecast for this year.

  • Spring: "10% after May 7" means that in about one spring out of ten a frost still happens after that date. The 90% date is the earliest: a frost after it happens in most years.
  • Fall: "10% before September 29" means that in about one fall out of ten the first frost arrives before that date.
  • 50% is the typical date: half of the years are earlier, half are later.
  • A light frost (32°F) damages tender plants; a hard frost (28°F) also stops most hardy vegetables.

Nearby weather stations

Map of weather stations near Perrysville, INNumbered nearest stations: 1 — Danville, IL — 9 mi; 2 — Hoopeston, IL — 29 mi; 3 — near Paris, IL — 33 mi; 4 — Lafayette, IN — 35 mi; 5 — Lafayette (Purdue University Airport), IN — 38 mi.INIL25 mi · 40 km1. Danville, IL — 9 mi12. Hoopeston, IL — 29 mi23. near Paris, IL — 33 mi34. Lafayette, IN — 35 mi45. Lafayette (Purdue University Airport), IN — 38 mi5
  1. Danville, IL 9 mi (14 km)
  2. Hoopeston, IL 29 mi (46 km)
  3. near Paris, IL 33 mi (52 km)
  4. Lafayette, IN 35 mi (57 km)
  5. Lafayette (Purdue University Airport), IN 38 mi (61 km)

Sources

* Hardiness zone 6a: zone derived from PRISM 2023 grid at the station location (not the official USDA map). Source data: PRISM Group, Oregon State University.

Station coordinates: 40.0739, -87.5067.