U.S. Frost Dates by Weather Station

NOAA station USW00024230 · Oregon

Frost Dates near Redmond, OR

NOAA weather station Redmond Roberts Field (USW00024230), Oregon · elevation 3043 ft (928 m) · hardiness zone 6b*

Redmond is the nearest town to the station (2.1 mi away) in GeoNames (CC BY 4.0). The dates below are measured at the station, not in the town itself.

  • Lower-risk planting dateafter June 26only 1 spring in 10 still has a frost later
  • Typical last frostJune 950% chance of a frost after it
  • Typical first fall frostSeptember 1450% chance of a frost before it
  • Frost-free season98 daystypical year, 32°F
  • Hardiness zone6bcalculated*

The year at a glance

Frost season near Redmond, ORSpring: a frost after May 17 in 9 years out of 10, after June 9 in half of the years, after June 26 in 1 year out of 10. Fall: the first frost comes before September 1 in 1 year out of 10, before September 14 in half of the years, before October 1 in 9 years out of 10. Typical frost-free season: 98 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Jun 9First frost ~Sep 14Frost season near Redmond, ORSpring: a frost after May 17 in 9 years out of 10, after June 9 in half of the years, after June 26 in 1 year out of 10. Fall: the first frost comes before September 1 in 1 year out of 10, before September 14 in half of the years, before October 1 in 9 years out of 10. Typical frost-free season: 98 days.JFMAMJJASONDLast frost ~Jun 9First frost ~Sep 14
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 25 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)June 26September 1
50% (typical)June 9September 14
90% (likely)May 17October 1
Frost-free season (32°F, 50% chance)
98 days
Hard frost (28°F), last in spring, 50% chance after
May 14
Hard frost (28°F), first in fall, 50% chance before
September 30

The last 15 years (2006–2020 normals)

Typical last frost June 9 (same as the 30-year normal), typical first fall frost September 14. Frost-free season 98 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 near Redmond: chance of a frost after this dateSpring, chance of a frost after the date: 10% June 26, 20% June 21, 30% June 17, 40% June 13, 50% June 9, 60% June 4, 70% May 31, 80% May 25, 90% May 17. Observed last spring frost in recent years: 2021 June 9, 2022 May 30, 2023 June 20, 2024 June 18, 2025 June 14, 2026 June 10.Spring: last frostChance of a frost after this date10%50%90%Jun 1Jul 1Jun 26Jun 9May 172021: June 92022: May 302023: June 202024: June 182025: June 142026: June 10Fall near Redmond: chance of a frost before this dateFall, chance of a frost before the date: 10% September 1, 20% September 5, 30% September 8, 40% September 12, 50% September 14, 60% September 19, 70% September 22, 80% September 26, 90% October 1. Observed first fall frost in recent years: 2021 September 1, 2022 September 10, 2023 September 22, 2024 September 30, 2025 September 15.Fall: first frostChance of a frost before this date10%50%90%Sep 1Oct 1Sep 1Sep 14Oct 12021: September 12022: September 102023: September 222024: September 302025: September 15
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
2021June 9September 1
2022May 30September 10
2023June 20September 22
2024June 18September 30
2025June 14September 15
2026June 10season not over yet

What these dates mean

Setting out tender crops on May 17 in the Redmond area is a gamble, carrying a 90% chance of a light frost later. The cautious spring date for tender crops is June 26, when only a 10% chance of a frost remains. The 50% date is June 9, meaning there is an even chance of a light frost later than this date. The median hard-frost date is May 14, marking the point where a 28°F frost is equally likely.

In the fall, the cautious date to finish harvesting tender crops is September 1, with only a 10% chance that a light frost has already arrived. The 50% date is September 14, meaning an even chance of a light frost earlier than this date, and the median hard-frost date is September 30. A hard frost matters more than a light frost because temperatures of 28°F can damage plant tissue that survives the milder 32°F threshold.

How to read the probabilities

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

  • Spring: "10% after June 26" 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 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 Redmond, ORNumbered nearest stations: 1 — near Warm Springs, OR — 33 mi; 2 — Marion Forks Fish Hatchery, OR — 47 mi; 3 — near La Pine, OR — 48 mi; 4 — Barnes Station, OR — 51 mi; 5 — near Oakridge, OR — 74 mi.OR25 mi · 40 km1. near Warm Springs, OR — 33 mi12. Marion Forks Fish Hatchery, OR — 47 mi23. near La Pine, OR — 48 mi34. Barnes Station, OR — 51 mi45. near Oakridge, OR — 74 mi5
  1. near Warm Springs, OR 33 mi (53 km)
  2. Marion Forks Fish Hatchery, OR 47 mi (76 km)
  3. near La Pine, OR 48 mi (77 km)
  4. Barnes Station, OR 51 mi (81 km)
  5. near Oakridge, OR 74 mi (119 km)

Sources

* Hardiness zone 6b: zone derived from PRISM 2023 grid at the station location (not the official USDA map). Source data: PRISM Group, Oregon State University.

Station coordinates: 44.2558, -121.1392.