U.S. Frost Dates by Weather Station

NOAA station USC00359316 · Oregon

Frost Dates near La Pine, OR

NOAA weather station Wickiup Dam (USC00359316), Oregon · elevation 4358 ft (1328 m) · hardiness zone 6b*

La Pine is the nearest town to the station (9.2 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 July 2only 1 spring in 10 still has a frost later
  • Typical last frostJune 750% chance of a frost after it
  • Typical first fall frostSeptember 1850% chance of a frost before it
  • Frost-free season100 daystypical year, 32°F
  • Hardiness zone6bcalculated*

The year at a glance

Frost season near La Pine, ORSpring: a frost after May 16 in 9 years out of 10, after June 7 in half of the years, after July 2 in 1 year out of 10. Fall: the first frost comes before September 3 in 1 year out of 10, before September 18 in half of the years, before October 3 in 9 years out of 10. Typical frost-free season: 100 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Jun 7First frost ~Sep 18Frost season near La Pine, ORSpring: a frost after May 16 in 9 years out of 10, after June 7 in half of the years, after July 2 in 1 year out of 10. Fall: the first frost comes before September 3 in 1 year out of 10, before September 18 in half of the years, before October 3 in 9 years out of 10. Typical frost-free season: 100 days.JFMAMJJASONDLast frost ~Jun 7First frost ~Sep 18
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 27 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)July 2September 3
50% (typical)June 7September 18
90% (likely)May 16October 3
Frost-free season (32°F, 50% chance)
100 days
Hard frost (28°F), last in spring, 50% chance after
May 16
Hard frost (28°F), first in fall, 50% chance before
October 3

The last 15 years (2006–2020 normals)

Typical last frost June 4 (3 days earlier than the 30-year normal), typical first fall frost September 21 (3 days later). Frost-free season 110 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 La Pine: chance of a frost after this dateSpring, chance of a frost after the date: 10% July 2, 20% June 21, 30% June 16, 40% June 12, 50% June 7, 60% June 2, 70% May 29, 80% May 23, 90% May 16. Observed last spring frost in recent years: 2021 June 6, 2022 May 30, 2023 June 20.Spring: last frostChance of a frost after this date10%50%90%Jun 1Jul 1Jul 2Jun 7May 162021: June 62022: May 302023: June 20Fall near La Pine: chance of a frost before this dateFall, chance of a frost before the date: 10% September 3, 20% September 8, 30% September 12, 40% September 15, 50% September 18, 60% September 21, 70% September 25, 80% September 28, 90% October 3. Observed first fall frost in recent years: 2021 August 24, 2022 October 10, 2023 September 22.Fall: first frostChance of a frost before this date10%50%90%Sep 1Oct 1Sep 3Sep 18Oct 32021: August 242022: October 102023: September 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
2021June 6August 24
2022May 30October 10
2023June 20September 22
2024no datano data
2025no datano data
2026no dataseason not over yet

What these dates mean

September 3 marks the cautious fall date for the La Pine area, because only a 10 % chance of a light frost has occurred before then, making it the point to aim for finishing the harvest of tender crops.

In spring the cautious date for setting out tender crops is July 2, when there is only a 10 % chance of a light frost later. The 50 % dates—June 7 for spring and September 18 for fall—represent the median odds of a light frost occurring, a useful reference for gauging risk.

A hard frost, defined by 28 °F temperatures, is more damaging than a light frost at 32 °F, so the hard-frost 50 % dates of May 16 and October 3 are noted separately for their greater threat to plants. The 27-year record provides confidence in these probabilities.

How to read the probabilities

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

  • Spring: "10% after July 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 September 3" 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 La Pine, ORNumbered nearest stations: 1 — near Oakridge, OR — 38 mi; 2 — Toketee Falls, OR — 47 mi; 3 — near Redmond, OR — 48 mi; 4 — near Lowell, OR — 56 mi; 5 — Leaburg, OR — 58 mi.OR25 mi · 40 km1. near Oakridge, OR — 38 mi12. Toketee Falls, OR — 47 mi23. near Redmond, OR — 48 mi34. near Lowell, OR — 56 mi45. Leaburg, OR — 58 mi5
  1. near Oakridge, OR 38 mi (61 km)
  2. Toketee Falls, OR 47 mi (76 km)
  3. near Redmond, OR 48 mi (77 km)
  4. near Lowell, OR 56 mi (90 km)
  5. Leaburg, OR 58 mi (93 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: 43.6825, -121.6875.