U.S. Frost Dates by Weather Station

NOAA station USC00028162 · Arizona

Frost Dates for Springerville, AZ

NOAA weather station Springerville (USC00028162), Arizona · elevation 6998 ft (2133 m) · hardiness zone 6a*

  • Lower-risk planting dateafter June 20only 1 spring in 10 still has a frost later
  • Typical last frostJune 150% chance of a frost after it
  • Typical first fall frostSeptember 2650% chance of a frost before it
  • Frost-free season114 daystypical year, 32°F
  • Hardiness zone6acalculated*

The year at a glance

Frost season at Springerville, AZSpring: a frost after May 17 in 9 years out of 10, after June 1 in half of the years, after June 20 in 1 year out of 10. Fall: the first frost comes before September 12 in 1 year out of 10, before September 26 in half of the years, before October 7 in 9 years out of 10. Typical frost-free season: 114 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Jun 1First frost ~Sep 26Frost season at Springerville, AZSpring: a frost after May 17 in 9 years out of 10, after June 1 in half of the years, after June 20 in 1 year out of 10. Fall: the first frost comes before September 12 in 1 year out of 10, before September 26 in half of the years, before October 7 in 9 years out of 10. Typical frost-free season: 114 days.JFMAMJJASONDLast frost ~Jun 1First frost ~Sep 26
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 26 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)June 20September 12
50% (typical)June 1September 26
90% (likely)May 17October 7
Frost-free season (32°F, 50% chance)
114 days
Hard frost (28°F), last in spring, 50% chance after
May 18
Hard frost (28°F), first in fall, 50% chance before
October 3

The last 15 years (2006–2020 normals)

Typical last frost May 31 (1 day earlier than the 30-year normal), typical first fall frost September 25 (1 day earlier). Frost-free season 117 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 Springerville: chance of a frost after this dateSpring, chance of a frost after the date: 10% June 20, 20% June 12, 30% June 7, 40% June 4, 50% June 1, 60% May 31, 70% May 27, 80% May 23, 90% May 17. Observed last spring frost in recent years: 2021 May 25, 2022 May 25, 2023 June 10, 2024 June 1, 2025 May 30, 2026 July 2.Spring: last frostChance of a frost after this date10%50%90%Jun 1Jul 1Jun 20Jun 1May 172021: May 252022: May 252023: June 102024: June 12025: May 302026: July 2Fall at Springerville: chance of a frost before this dateFall, chance of a frost before the date: 10% September 12, 20% September 17, 30% September 21, 40% September 24, 50% September 26, 60% September 29, 70% October 1, 80% October 3, 90% October 7. Observed first fall frost in recent years: 2021 October 1, 2022 October 13, 2023 October 3, 2024 September 21, 2025 October 7.Fall: first frostChance of a frost before this date10%50%90%Sep 1Oct 1Sep 12Sep 26Oct 72021: October 12022: October 132023: October 32024: September 212025: October 7
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
2021May 25October 1
2022May 25October 13
2023June 10October 3
2024June 1September 21
2025May 30October 7
2026July 2season not over yet

What these dates mean

September 12 is the cautious fall date in Springerville for finishing the harvest, because there is only a 10 % chance that a light frost has arrived before then.

The 50 % dates mark the median point of frost risk: June 1 in spring and September 26 in fall each carry an even chance of a 32 °F frost occurring later (spring) or earlier (fall). A cautious planting plan therefore uses June 20 as the latest recommended day to set out tender crops in spring and September 12 as the earliest recommended day to finish harvesting them in fall.

The hard-frost median dates, May 18 and October 3, indicate when a 28 °F frost becomes a 50 % possibility, and hard frost can damage plants more severely than a light frost.

How to read the probabilities

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

  • Spring: "10% after June 20" 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 12" 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 Springerville, AZNumbered nearest stations: 1 — Saint Johns, AZ — 28 mi; 2 — McNary, AZ — 33 mi; 3 — Show Low, AZ — 43 mi; 4 — Petrified Forest National Park, AZ — 58 mi; 5 — Zuni, NM — 69 mi.AZNM25 mi · 40 km1. Saint Johns, AZ — 28 mi12. McNary, AZ — 33 mi23. Show Low, AZ — 43 mi34. Petrified Forest National Park, AZ — 58 mi45. Zuni, NM — 69 mi5
  1. Saint Johns, AZ 28 mi (45 km)
  2. McNary, AZ 33 mi (54 km)
  3. Show Low, AZ 43 mi (69 km)
  4. Petrified Forest National Park, AZ 58 mi (93 km)
  5. Zuni, NM 69 mi (112 km)

Sources

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

Station coordinates: 34.1311, -109.275.