U.S. Frost Dates by Weather Station

NOAA station USC00212645 · Minnesota

Frost Dates for Eveleth, MN

NOAA weather station Eveleth WWTP (USC00212645), Minnesota · elevation 1445 ft (440 m) · hardiness zone 4a*

  • Lower-risk planting dateafter May 28only 1 spring in 10 still has a frost later
  • Typical last frostMay 1250% chance of a frost after it
  • Typical first fall frostOctober 150% chance of a frost before it
  • Frost-free season141 daystypical year, 32°F
  • Hardiness zone4acalculated*

The year at a glance

Frost season at Eveleth, MNSpring: a frost after April 30 in 9 years out of 10, after May 12 in half of the years, after May 28 in 1 year out of 10. Fall: the first frost comes before September 18 in 1 year out of 10, before October 1 in half of the years, before October 14 in 9 years out of 10. Typical frost-free season: 141 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~May 12First frost ~Oct 1Frost season at Eveleth, MNSpring: a frost after April 30 in 9 years out of 10, after May 12 in half of the years, after May 28 in 1 year out of 10. Fall: the first frost comes before September 18 in 1 year out of 10, before October 1 in half of the years, before October 14 in 9 years out of 10. Typical frost-free season: 141 days.JFMAMJJASONDLast frost ~May 12First frost ~Oct 1
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 28September 18
50% (typical)May 12October 1
90% (likely)April 30October 14
Frost-free season (32°F, 50% chance)
141 days
Hard frost (28°F), last in spring, 50% chance after
May 3
Hard frost (28°F), first in fall, 50% chance before
October 13

The last 15 years (2006–2020 normals)

Typical last frost May 12 (same as the 30-year normal), typical first fall frost October 5 (4 days later). Frost-free season 144 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 Eveleth: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 28, 20% May 23, 30% May 19, 40% May 15, 50% May 12, 60% May 9, 70% May 7, 80% May 4, 90% April 30. Observed last spring frost in recent years: 2021 May 29, 2024 April 29, 2025 May 19, 2026 May 12.Spring: last frostChance of a frost after this date10%50%90%May 1Jun 1May 28May 12Apr 302021: May 292024: April 292025: May 192026: May 12Fall at Eveleth: chance of a frost before this dateFall, chance of a frost before the date: 10% September 18, 20% September 23, 30% September 26, 40% September 28, 50% October 1, 60% October 3, 70% October 6, 80% October 9, 90% October 14. Observed first fall frost in recent years: 2021 October 21, 2024 October 16, 2025 October 8.Fall: first frostChance of a frost before this date10%50%90%Oct 1Sep 18Oct 1Oct 142021: October 212024: October 162025: October 8
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 29October 21
2022incomplete recordincomplete record
2023incomplete recordincomplete record
2024April 29October 16
2025May 19October 8
2026May 12season not over yet

What these dates mean

September 18 marks the cautious fall date in Eveleth for finishing the harvest of tender crops; only a 10 % chance exists that a light frost has arrived before that day. In spring the cautious date for setting out tender crops is May 28, when there is a 10 % chance of a frost occurring later than that day.

The 50% date is May 12, meaning there is an even chance of a light frost later than that day, while the 50% date is October 1, indicating an even chance of a light frost earlier than that day. The median hard-frost dates are May 3 in spring and October 13 in fall; hard frost at 28 °F can injure plants that would survive the 32 °F light frost. Gardeners who wish to limit risk should aim for the cautious dates and keep the hard-frost dates in mind.

How to read the probabilities

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

  • Spring: "10% after May 28" 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 18" 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 Eveleth, MNNumbered nearest stations: 1 — near Hibbing, MN — 15 mi; 2 — Floodwood, MN — 37 mi; 3 — near Grand Rapids, MN — 48 mi; 4 — Two Harbors, MN — 50 mi; 5 — Cloquet, MN — 52 mi.MNWI25 mi · 40 km1. near Hibbing, MN — 15 mi12. Floodwood, MN — 37 mi23. near Grand Rapids, MN — 48 mi34. Two Harbors, MN — 50 mi45. Cloquet, MN — 52 mi5
  1. near Hibbing, MN 15 mi (25 km)
  2. Floodwood, MN 37 mi (60 km)
  3. near Grand Rapids, MN 48 mi (77 km)
  4. Two Harbors, MN 50 mi (81 km)
  5. Cloquet, MN 52 mi (84 km)

Sources

* Hardiness zone 4a: zone derived from PRISM 2023 grid at the station location (not the official USDA map). Source data: PRISM Group, Oregon State University.

Station coordinates: 47.4581, -92.5303.