U.S. Frost Dates by Weather Station

NOAA station USC00452675 · Washington

Frost Dates for Everett, WA

NOAA weather station Everett (USC00452675), Washington · elevation 60 ft (18 m) · hardiness zone 8b*

  • Lower-risk planting dateafter April 11only 1 spring in 10 still has a frost later
  • Typical last frostMarch 2450% chance of a frost after it
  • Typical first fall frostNovember 250% chance of a frost before it
  • Frost-free season223 daystypical year, 32°F
  • Hardiness zone8bcalculated*

The year at a glance

Frost season at Everett, WASpring: a frost after March 4 in 9 years out of 10, after March 24 in half of the years, after April 11 in 1 year out of 10. Fall: the first frost comes before October 16 in 1 year out of 10, before November 2 in half of the years, before November 23 in 9 years out of 10. Typical frost-free season: 223 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Mar 24First frost ~Nov 2Frost season at Everett, WASpring: a frost after March 4 in 9 years out of 10, after March 24 in half of the years, after April 11 in 1 year out of 10. Fall: the first frost comes before October 16 in 1 year out of 10, before November 2 in half of the years, before November 23 in 9 years out of 10. Typical frost-free season: 223 days.JFMAMJJASONDLast frost ~Mar 24First frost ~Nov 2
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)April 11October 16
50% (typical)March 24November 2
90% (likely)March 4November 23
Frost-free season (32°F, 50% chance)
223 days
Hard frost (28°F), last in spring, 50% chance after
March 1
Hard frost (28°F), first in fall, 50% chance before
November 21

The last 15 years (2006–2020 normals)

Typical last frost March 21 (3 days earlier than the 30-year normal), typical first fall frost November 8 (6 days later). Frost-free season 231 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 Everett: chance of a frost after this dateSpring, chance of a frost after the date: 10% April 11, 20% April 4, 30% April 1, 40% March 29, 50% March 24, 60% March 21, 70% March 17, 80% March 12, 90% March 4. Observed last spring frost in recent years: 2022 March 10, 2023 April 5, 2024 March 7, 2025 February 15, 2026 March 10.Spring: last frostChance of a frost after this date10%50%90%Mar 1Apr 1Apr 11Mar 24Mar 42022: March 102023: April 52024: March 72025: February 152026: March 10Fall at Everett: chance of a frost before this dateFall, chance of a frost before the date: 10% October 16, 20% October 22, 30% October 27, 40% October 31, 50% November 2, 60% November 6, 70% November 11, 80% November 17, 90% November 23. Observed first fall frost in recent years: 2022 November 9, 2023 October 27, 2024 November 29, 2025 October 15.Fall: first frostChance of a frost before this date10%50%90%Nov 1Dec 1Oct 16Nov 2Nov 232022: November 92023: October 272024: November 292025: October 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
2021incomplete recordincomplete record
2022March 10November 9
2023April 5October 27
2024March 7November 29
2025February 15October 15
2026March 10season not over yet

What these dates mean

The cautious fall date for finishing the harvest in Everett is October 16, when there is only a 10 % chance that a light frost has already arrived.

For tender crops, the spring cautious date is April 11, the day with a 10 % chance of a light frost later, while planting on March 4 carries a 90 % chance of a later frost and is a gamble. The 50 % spring date, March 24, marks the point at which a light frost is equally likely to occur before or after, and the 50 % fall date, November 2, marks the same balance for the autumn season.

Hard frost at 28 °F is more consequential because it can injure plants that would survive a 32 °F light frost, and the median hard-frost dates are March 1 in spring and November 21 in fall.

How to read the probabilities

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

  • Spring: "10% after April 11" 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 16" 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 Everett, WANumbered nearest stations: 1 — near Kirkland, WA — 20 mi; 2 — Startup, WA — 23 mi; 3 — Coupeville, WA — 28 mi; 4 — Seattle (Seattle-Tacoma Airport), WA — 37 mi; 5 — Kent, WA — 39 mi.WA25 mi · 40 km1. near Kirkland, WA — 20 mi12. Startup, WA — 23 mi23. Coupeville, WA — 28 mi34. Seattle (Seattle-Tacoma Airport), WA — 37 mi45. Kent, WA — 39 mi5
  1. near Kirkland, WA 20 mi (32 km)
  2. Startup, WA 23 mi (38 km)
  3. Coupeville, WA 28 mi (45 km)
  4. Seattle (Seattle-Tacoma Airport), WA 37 mi (60 km)
  5. Kent, WA 39 mi (62 km)

Sources

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

Station coordinates: 47.9753, -122.195.