U.S. Frost Dates by Weather Station

NOAA station USC00114198 · Illinois

Frost Dates for Hoopeston, IL

NOAA weather station Hoopeston (USC00114198), Illinois · elevation 710 ft (216 m) · hardiness zone 6a*

  • Lower-risk planting dateafter May 8only 1 spring in 10 still has a frost later
  • Typical last frostApril 2250% chance of a frost after it
  • Typical first fall frostOctober 1950% chance of a frost before it
  • Frost-free season180 daystypical year, 32°F
  • Hardiness zone6acalculated*

The year at a glance

Frost season at Hoopeston, ILSpring: a frost after April 7 in 9 years out of 10, after April 22 in half of the years, after May 8 in 1 year out of 10. Fall: the first frost comes before October 5 in 1 year out of 10, before October 19 in half of the years, before November 1 in 9 years out of 10. Typical frost-free season: 180 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 22First frost ~Oct 19Frost season at Hoopeston, ILSpring: a frost after April 7 in 9 years out of 10, after April 22 in half of the years, after May 8 in 1 year out of 10. Fall: the first frost comes before October 5 in 1 year out of 10, before October 19 in half of the years, before November 1 in 9 years out of 10. Typical frost-free season: 180 days.JFMAMJJASONDLast frost ~Apr 22First frost ~Oct 19
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.Today

Frost dates (32°F)

Probability of frost, based on 28 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)May 8October 5
50% (typical)April 22October 19
90% (likely)April 7November 1
Frost-free season (32°F, 50% chance)
180 days
Hard frost (28°F), last in spring, 50% chance after
April 10
Hard frost (28°F), first in fall, 50% chance before
October 31

The last 15 years (2006–2020 normals)

Typical last frost April 23 (1 day later than the 30-year normal), typical first fall frost October 22 (3 days later). Frost-free season 181 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 Hoopeston: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 8, 20% May 2, 30% April 29, 40% April 25, 50% April 22, 60% April 19, 70% April 16, 80% April 12, 90% April 7. Observed last spring frost in recent years: 2021 May 8, 2022 April 27, 2023 April 26, 2024 April 25, 2025 April 16, 2026 April 20.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1May 8Apr 22Apr 72021: May 82022: April 272023: April 262024: April 252025: April 162026: April 20Fall at Hoopeston: chance of a frost before this dateFall, chance of a frost before the date: 10% October 5, 20% October 11, 30% October 14, 40% October 17, 50% October 19, 60% October 22, 70% October 25, 80% October 28, 90% November 1. Observed first fall frost in recent years: 2021 November 1, 2022 October 8, 2023 October 30, 2024 October 16, 2025 October 23.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 5Oct 19Nov 12021: November 12022: October 82023: October 302024: October 162025: October 23
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
2021May 8November 1
2022April 27October 8
2023April 26October 30
2024April 25October 16
2025April 16October 23
2026April 20season not over yet

What these dates mean

October 5 is the cautious fall date in Hoopeston for finishing the harvest, with only a 10% chance that a light frost has arrived earlier. Gardeners who wait until the 50% date of October 19 know there is an even odds of a light frost before that point.

In spring the cautious date for setting out tender crops is May 8, which carries a 10% chance of a light frost later. The 50% date of April 22 marks the point at which a light frost is equally likely, while planting on April 7 involves a 90% chance of a frost later and is a gamble.

Hard frost reaches 28 °F, a temperature that can damage plant tissue more severely than the 32 °F of light frost; the 50% hard-frost dates are April 10 in spring and October 31 in fall.

How to read the probabilities

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

  • Spring: "10% after May 8" 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 October 5" 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 Hoopeston, ILNumbered nearest stations: 1 — Danville, IL — 23 mi; 2 — Watseka, IL — 23 mi; 3 — Rantoul, IL — 27 mi; 4 — Perrysville, IN — 29 mi; 5 — West Lafayette, IN — 36 mi.25 mi · 40 km1. Danville, IL — 23 mi12. Watseka, IL — 23 mi23. Rantoul, IL — 27 mi34. Perrysville, IN — 29 mi45. West Lafayette, IN — 36 mi5
  1. Danville, IL 23 mi (37 km)
  2. Watseka, IL 23 mi (37 km)
  3. Rantoul, IL 27 mi (44 km)
  4. Perrysville, IN 29 mi (46 km)
  5. West Lafayette, IN 36 mi (59 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: 40.4664, -87.685.