U.S. Frost Dates by Weather Station

NOAA station USC00120200 · Indiana

Frost Dates for Angola, IN

NOAA weather station Angola (USC00120200), Indiana · elevation 1020 ft (311 m) · hardiness zone 6a*

  • Lower-risk planting dateafter May 15only 1 spring in 10 still has a frost later
  • Typical last frostApril 3050% chance of a frost after it
  • Typical first fall frostOctober 1650% chance of a frost before it
  • Frost-free season167 daystypical year, 32°F
  • Hardiness zone6acalculated*

The year at a glance

Frost season at Angola, INSpring: a frost after April 17 in 9 years out of 10, after April 30 in half of the years, after May 15 in 1 year out of 10. Fall: the first frost comes before October 1 in 1 year out of 10, before October 16 in half of the years, before October 31 in 9 years out of 10. Typical frost-free season: 167 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 30First frost ~Oct 16Frost season at Angola, INSpring: a frost after April 17 in 9 years out of 10, after April 30 in half of the years, after May 15 in 1 year out of 10. Fall: the first frost comes before October 1 in 1 year out of 10, before October 16 in half of the years, before October 31 in 9 years out of 10. Typical frost-free season: 167 days.JFMAMJJASONDLast frost ~Apr 30First frost ~Oct 16
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 30 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)May 15October 1
50% (typical)April 30October 16
90% (likely)April 17October 31
Frost-free season (32°F, 50% chance)
167 days
Hard frost (28°F), last in spring, 50% chance after
April 19
Hard frost (28°F), first in fall, 50% chance before
October 29

The last 15 years (2006–2020 normals)

Typical last frost April 29 (1 day earlier than the 30-year normal), typical first fall frost October 21 (5 days later). Frost-free season 173 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 Angola: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 15, 20% May 9, 30% May 6, 40% May 3, 50% April 30, 60% April 28, 70% April 25, 80% April 22, 90% April 17. Observed last spring frost in recent years: 2021 May 12, 2022 April 29, 2023 April 27, 2024 April 26.Spring: last frostChance of a frost after this date10%50%90%May 1May 15Apr 30Apr 172021: May 122022: April 292023: April 272024: April 26Fall at Angola: chance of a frost before this dateFall, chance of a frost before the date: 10% October 1, 20% October 6, 30% October 10, 40% October 13, 50% October 16, 60% October 19, 70% October 22, 80% October 26, 90% October 31. Observed first fall frost in recent years: 2021 October 24, 2022 October 8, 2023 October 23, 2024 October 27, 2025 October 25.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 1Oct 16Oct 312021: October 242022: October 82023: October 232024: October 272025: October 25
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 12October 24
2022April 29October 8
2023April 27October 23
2024April 26October 27
2025incomplete recordOctober 25
2026incomplete recordseason not over yet

What these dates mean

Planting tender crops on April 17 carries a 90% chance of a frost, making it a gamble for growers in Angola. The more cautious approach waits until May 15, when only a 10% chance of a frost remains, before setting out tender varieties.

For autumn harvest, the cautious date is October 1, which has a 10% chance that a frost has already arrived. The 50% date is April 30; there is a 50% chance of a frost later than this date. In the fall the 50% date is October 16; there is a 50% chance of a frost earlier than this date. These median dates mark the point at which frost risk is evenly split over the 30-year record.

Hard-frost thresholds fall at 28 °F, with the 50% dates April 19 in spring and October 29 in fall; a hard frost can damage plants more severely than a light frost because it reaches a temperature that injures tissue that survives a 32 °F chill.

How to read the probabilities

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

  • Spring: "10% after May 15" 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 1" 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 Angola, INNumbered nearest stations: 1 — near Coldwater, MI — 21 mi; 2 — Garrett, IN — 23 mi; 3 — Hillsdale, MI — 27 mi; 4 — Three Rivers, MI — 37 mi; 5 — Defiance, OH — 42 mi.IN25 mi · 40 km1. near Coldwater, MI — 21 mi12. Garrett, IN — 23 mi23. Hillsdale, MI — 27 mi34. Three Rivers, MI — 37 mi45. Defiance, OH — 42 mi5
  1. near Coldwater, MI 21 mi (33 km)
  2. Garrett, IN 23 mi (37 km)
  3. Hillsdale, MI 27 mi (43 km)
  4. Three Rivers, MI 37 mi (59 km)
  5. Defiance, OH 42 mi (68 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: 41.6639, -85.0183.