U.S. Frost Dates by Weather Station

NOAA station USC00353402 · Oregon

Frost Dates for Government Camp, OR

NOAA weather station Government Camp (USC00353402), Oregon · elevation 3980 ft (1213 m) · hardiness zone 7b*

  • Lower-risk planting dateafter June 14only 1 spring in 10 still has a frost later
  • Typical last frostMay 2750% chance of a frost after it
  • Typical first fall frostOctober 950% chance of a frost before it
  • Frost-free season134 daystypical year, 32°F
  • Hardiness zone7bcalculated*

The year at a glance

Frost season at Government Camp, ORSpring: a frost after May 4 in 9 years out of 10, after May 27 in half of the years, after June 14 in 1 year out of 10. Fall: the first frost comes before September 18 in 1 year out of 10, before October 9 in half of the years, before October 26 in 9 years out of 10. Typical frost-free season: 134 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~May 27First frost ~Oct 9Frost season at Government Camp, ORSpring: a frost after May 4 in 9 years out of 10, after May 27 in half of the years, after June 14 in 1 year out of 10. Fall: the first frost comes before September 18 in 1 year out of 10, before October 9 in half of the years, before October 26 in 9 years out of 10. Typical frost-free season: 134 days.JFMAMJJASONDLast frost ~May 27First frost ~Oct 9
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 14September 18
50% (typical)May 27October 9
90% (likely)May 4October 26
Frost-free season (32°F, 50% chance)
134 days
Hard frost (28°F), last in spring, 50% chance after
May 3
Hard frost (28°F), first in fall, 50% chance before
October 28

The last 15 years (2006–2020 normals)

Typical last frost May 26 (1 day earlier than the 30-year normal), typical first fall frost October 7 (2 days earlier). Frost-free season 137 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 Government Camp: chance of a frost after this dateSpring, chance of a frost after the date: 10% June 14, 20% June 8, 30% June 2, 40% May 31, 50% May 27, 60% May 22, 70% May 18, 80% May 12, 90% May 4. Observed last spring frost in recent years: 2021 June 9, 2022 May 30, 2023 June 19, 2024 June 18, 2025 May 21, 2026 May 29.Spring: last frostChance of a frost after this date10%50%90%May 1Jun 1Jun 14May 27May 42021: June 92022: May 302023: June 192024: June 182025: May 212026: May 29Fall at Government Camp: chance of a frost before this dateFall, chance of a frost before the date: 10% September 18, 20% September 27, 30% October 1, 40% October 5, 50% October 9, 60% October 13, 70% October 16, 80% October 20, 90% October 26. Observed first fall frost in recent years: 2021 September 15, 2022 October 22, 2023 October 25, 2024 September 29, 2025 October 12.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Sep 18Oct 9Oct 262021: September 152022: October 222023: October 252024: September 292025: October 12
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 15
2022May 30October 22
2023June 19October 25
2024June 18September 29
2025May 21October 12
2026May 29season not over yet

What these dates mean

The 134 days between the 50% dates in Government Camp—May 27 and October 9—constitute the period in which a light frost (32 °F) is equally likely to have occurred or not, and it defines the core window for tender crops. The median hard-frost dates are May 3 in spring and October 28 in fall; these colder thresholds are separate from the light-frost calendar.

In spring the cautious date for setting out tender crops is June 14, when there is only a 10 % chance of a light frost later, while planting on May 4 carries a 90 % chance and is a gamble. In fall the cautious date to finish harvesting tender crops is September 18, with a 10 % chance of a light frost earlier, whereas staying until October 26 involves a 90 % chance of a frost and is risky.

Hard frost at 28 °F can damage plants more severely than the lighter 32 °F frost, so its 50 % dates are especially relevant for growers.

How to read the probabilities

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

  • Spring: "10% after June 14" 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 Government Camp, ORNumbered nearest stations: 1 — Three Lynx, OR — 20 mi; 2 — near Sandy, OR — 22 mi; 3 — near Cascade Locks, OR — 25 mi; 4 — Estacada, OR — 28 mi; 5 — near Dallesport, WA — 36 mi.WA25 mi · 40 km1. Three Lynx, OR — 20 mi12. near Sandy, OR — 22 mi23. near Cascade Locks, OR — 25 mi34. Estacada, OR — 28 mi45. near Dallesport, WA — 36 mi5
  1. Three Lynx, OR 20 mi (32 km)
  2. near Sandy, OR 22 mi (36 km)
  3. near Cascade Locks, OR 25 mi (41 km)
  4. Estacada, OR 28 mi (45 km)
  5. near Dallesport, WA 36 mi (57 km)

Sources

* Hardiness zone 7b: zone derived from PRISM 2023 grid at the station location (not the official USDA map). Source data: PRISM Group, Oregon State University.

Station coordinates: 45.3008, -121.7425.