U.S. Frost Dates by Weather Station

NOAA station USC00358466 · Oregon

Frost Dates for Three Lynx, OR

NOAA weather station Three Lynx (USC00358466), Oregon · elevation 1120 ft (341 m) · hardiness zone 8a*

  • Lower-risk planting dateafter April 30only 1 spring in 10 still has a frost later
  • Typical last frostApril 550% chance of a frost after it
  • Typical first fall frostNovember 850% chance of a frost before it
  • Frost-free season217 daystypical year, 32°F
  • Hardiness zone8acalculated*

The year at a glance

Frost season at Three Lynx, ORSpring: a frost after March 13 in 9 years out of 10, after April 5 in half of the years, after April 30 in 1 year out of 10. Fall: the first frost comes before October 20 in 1 year out of 10, before November 8 in half of the years, before December 1 in 9 years out of 10. Typical frost-free season: 217 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 5First frost ~Nov 8Frost season at Three Lynx, ORSpring: a frost after March 13 in 9 years out of 10, after April 5 in half of the years, after April 30 in 1 year out of 10. Fall: the first frost comes before October 20 in 1 year out of 10, before November 8 in half of the years, before December 1 in 9 years out of 10. Typical frost-free season: 217 days.JFMAMJJASONDLast frost ~Apr 5First frost ~Nov 8
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)April 30October 20
50% (typical)April 5November 8
90% (likely)March 13December 1
Frost-free season (32°F, 50% chance)
217 days
Hard frost (28°F), last in spring, 50% chance after
February 26
Hard frost (28°F), first in fall, 50% chance before
November 30

The last 15 years (2006–2020 normals)

Typical last frost April 6 (1 day later than the 30-year normal), typical first fall frost November 10 (2 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 Three Lynx: chance of a frost after this dateSpring, chance of a frost after the date: 10% April 30, 20% April 23, 30% April 16, 40% April 10, 50% April 5, 60% April 1, 70% March 28, 80% March 21, 90% March 13. Observed last spring frost in recent years: 2021 April 12, 2023 April 5, 2024 March 8, 2025 April 17, 2026 March 27.Spring: last frostChance of a frost after this date10%50%90%Mar 1Apr 1May 1Apr 30Apr 5Mar 132021: April 122023: April 52024: March 82025: April 172026: March 27Fall at Three Lynx: chance of a frost before this dateFall, chance of a frost before the date: 10% October 20, 20% October 26, 30% October 30, 40% November 3, 50% November 8, 60% November 13, 70% November 18, 80% November 24, 90% December 1. Observed first fall frost in recent years: 2021 November 21, 2022 November 9, 2023 October 25, 2024 November 20, 2025 October 16.Fall: first frostChance of a frost before this date10%50%90%Nov 1Dec 1Oct 20Nov 8Dec 12021: November 212022: November 92023: October 252024: November 202025: October 16
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 12November 21
2022incomplete recordNovember 9
2023April 5October 25
2024March 8November 20
2025April 17October 16
2026March 27season not over yet

What these dates mean

The cautious fall date in Three Lynx for finishing the harvest is October 20, when there is only a 10 % chance that a light frost has arrived. For spring, the cautious date for setting out tender crops is April 30, a point at which only a 10 % chance of a later light frost remains.

The 50% spring light-frost date is April 5, a 50 % chance of a frost later than this date, and the 50% fall light-frost date is November 8, a 50 % chance of a frost earlier than this date. The median hard-frost dates are February 26 in spring and November 30 in fall, indicating when a 28 °F frost is equally likely to have occurred or not.

A hard frost at 28 °F can damage plants that would survive the milder 32 °F light frost, making it the more critical temperature threshold.

How to read the probabilities

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

  • Spring: "10% after April 30" 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 20" 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 Three Lynx, ORNumbered nearest stations: 1 — Estacada, OR — 16 mi; 2 — Government Camp, OR — 20 mi; 3 — near Sandy, OR — 23 mi; 4 — Silverton, OR — 35 mi; 5 — Marion Forks Fish Hatchery, OR — 36 mi.ORWA25 mi · 40 km1. Estacada, OR — 16 mi12. Government Camp, OR — 20 mi23. near Sandy, OR — 23 mi34. Silverton, OR — 35 mi45. Marion Forks Fish Hatchery, OR — 36 mi5
  1. Estacada, OR 16 mi (25 km)
  2. Government Camp, OR 20 mi (32 km)
  3. near Sandy, OR 23 mi (37 km)
  4. Silverton, OR 35 mi (57 km)
  5. Marion Forks Fish Hatchery, OR 36 mi (57 km)

Sources

* Hardiness zone 8a: zone derived from PRISM 2023 grid at the station location (not the official USDA map). Source data: PRISM Group, Oregon State University.

Station coordinates: 45.1219, -122.07.