U.S. Frost Dates by Weather Station

NOAA station USC00354811 · Oregon

Frost Dates for Leaburg, OR

NOAA weather station Leaburg 1 SW (USC00354811), Oregon · elevation 675 ft (206 m) · hardiness zone 9a*

  • Lower-risk planting dateafter May 2only 1 spring in 10 still has a frost later
  • Typical last frostApril 350% chance of a frost after it
  • Typical first fall frostNovember 1150% chance of a frost before it
  • Frost-free season220 daystypical year, 32°F
  • Hardiness zone9acalculated*

The year at a glance

Frost season at Leaburg, ORSpring: a frost after March 5 in 9 years out of 10, after April 3 in half of the years, after May 2 in 1 year out of 10. Fall: the first frost comes before October 21 in 1 year out of 10, before November 11 in half of the years, before December 5 in 9 years out of 10. Typical frost-free season: 220 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 3First frost ~Nov 11Frost season at Leaburg, ORSpring: a frost after March 5 in 9 years out of 10, after April 3 in half of the years, after May 2 in 1 year out of 10. Fall: the first frost comes before October 21 in 1 year out of 10, before November 11 in half of the years, before December 5 in 9 years out of 10. Typical frost-free season: 220 days.JFMAMJJASONDLast frost ~Apr 3First frost ~Nov 11
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 29 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)May 2October 21
50% (typical)April 3November 11
90% (likely)March 5December 5
Frost-free season (32°F, 50% chance)
220 days
Hard frost (28°F), last in spring, 50% chance after
February 22
Hard frost (28°F), first in fall, 50% chance before
December 4

The last 15 years (2006–2020 normals)

Typical last frost April 5 (2 days later than the 30-year normal), typical first fall frost November 14 (3 days later). Frost-free season 214 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 Leaburg: chance of a frost after this dateSpring, chance of a frost after the date: 10% May 2, 20% April 24, 30% April 16, 40% April 9, 50% April 3, 60% March 30, 70% March 24, 80% March 16, 90% March 5. Observed last spring frost in recent years: 2021 April 14, 2022 April 18, 2023 March 31, 2024 April 17, 2025 April 13, 2026 April 17.Spring: last frostChance of a frost after this date10%50%90%Mar 1Apr 1May 1May 2Apr 3Mar 52021: April 142022: April 182023: March 312024: April 172025: April 132026: April 17Fall at Leaburg: chance of a frost before this dateFall, chance of a frost before the date: 10% October 21, 20% October 28, 30% November 1, 40% November 6, 50% November 11, 60% November 16, 70% November 22, 80% November 29, 90% December 5. Observed first fall frost in recent years: 2021 October 9, 2022 November 9, 2023 October 27, 2024 November 24, 2025 November 22.Fall: first frostChance of a frost before this date10%50%90%Nov 1Dec 1Oct 21Nov 11Dec 52021: October 92022: November 92023: October 272024: November 242025: November 22
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 14October 9
2022April 18November 9
2023March 31October 27
2024April 17November 24
2025April 13November 22
2026April 17season not over yet

What these dates mean

October 21 marks the cautious fall date in Leaburg for finishing the harvest, when there is only a 10 % chance that a light frost has arrived.

In spring the cautious date for setting out tender crops is May 2, which carries a 10 % chance of a light frost later; the 50% spring light-frost date is April 3, indicating an even-odds point for a frost. The 50% spring hard-frost date is February 22. In fall the cautious date for completing tender crops is October 21, with a 10 % chance of a frost earlier; the 50% fall light-frost date is November 11 and the 50% fall hard-frost date is December 4.

A hard frost at 28 °F can cause damage that a 32 °F light frost typically does not, making the hard-frost dates especially relevant to growers.

How to read the probabilities

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

  • Spring: "10% after May 2" 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 21" 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 Leaburg, ORNumbered nearest stations: 1 — near Lowell, OR — 13 mi; 2 — near Sweet Home, OR — 22 mi; 3 — Dorena, OR — 26 mi; 4 — near Eugene, OR — 26 mi; 5 — Cottage Grove, OR — 27 mi.25 mi · 40 km1. near Lowell, OR — 13 mi12. near Sweet Home, OR — 22 mi23. Dorena, OR — 26 mi34. near Eugene, OR — 26 mi45. Cottage Grove, OR — 27 mi5
  1. near Lowell, OR 13 mi (22 km)
  2. near Sweet Home, OR 22 mi (35 km)
  3. Dorena, OR 26 mi (42 km)
  4. near Eugene, OR 26 mi (43 km)
  5. Cottage Grove, OR 27 mi (44 km)

Sources

* Hardiness zone 9a: zone derived from PRISM 2023 grid at the station location (not the official USDA map). Source data: PRISM Group, Oregon State University.

Station coordinates: 44.1014, -122.6886.