U.S. Frost Dates by Weather Station

NOAA station USW00023154 · Nevada

Frost Dates near Ely, NV

NOAA weather station Ely Yelland Field Airport (USW00023154), Nevada · elevation 6262 ft (1909 m) · hardiness zone 5b*

Ely is the nearest town to the station (4.0 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 28only 1 spring in 10 still has a frost later
  • Typical last frostJune 1250% chance of a frost after it
  • Typical first fall frostSeptember 1350% chance of a frost before it
  • Frost-free season91 daystypical year, 32°F
  • Hardiness zone5bcalculated*

The year at a glance

Frost season near Ely, NVSpring: a frost after May 29 in 9 years out of 10, after June 12 in half of the years, after June 28 in 1 year out of 10. Fall: the first frost comes before August 31 in 1 year out of 10, before September 13 in half of the years, before September 26 in 9 years out of 10. Typical frost-free season: 91 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Jun 12First frost ~Sep 13Frost season near Ely, NVSpring: a frost after May 29 in 9 years out of 10, after June 12 in half of the years, after June 28 in 1 year out of 10. Fall: the first frost comes before August 31 in 1 year out of 10, before September 13 in half of the years, before September 26 in 9 years out of 10. Typical frost-free season: 91 days.JFMAMJJASONDLast frost ~Jun 12First frost ~Sep 13
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)June 28August 31
50% (typical)June 12September 13
90% (likely)May 29September 26
Frost-free season (32°F, 50% chance)
91 days
Hard frost (28°F), last in spring, 50% chance after
May 31
Hard frost (28°F), first in fall, 50% chance before
September 23

The last 15 years (2006–2020 normals)

Typical last frost June 11 (1 day earlier than the 30-year normal), typical first fall frost September 14 (1 day later). Frost-free season 93 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 Ely: chance of a frost after this dateSpring, chance of a frost after the date: 10% June 28, 20% June 23, 30% June 19, 40% June 16, 50% June 12, 60% June 10, 70% June 6, 80% June 3, 90% May 29. Observed last spring frost in recent years: 2021 June 11, 2022 June 20, 2023 June 21, 2024 June 19, 2025 June 22, 2026 June 29.Spring: last frostChance of a frost after this date10%50%90%Jun 1Jul 1Jun 28Jun 12May 292021: June 112022: June 202023: June 212024: June 192025: June 222026: June 29Fall near Ely: chance of a frost before this dateFall, chance of a frost before the date: 10% August 31, 20% September 4, 30% September 7, 40% September 10, 50% September 13, 60% September 15, 70% September 18, 80% September 22, 90% September 26. Observed first fall frost in recent years: 2021 August 20, 2022 October 1, 2023 September 22, 2024 August 26, 2025 September 24.Fall: first frostChance of a frost before this date10%50%90%Sep 1Oct 1Aug 31Sep 13Sep 262021: August 202022: October 12023: September 222024: August 262025: September 24
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 11August 20
2022June 20October 1
2023June 21September 22
2024June 19August 26
2025June 22September 24
2026June 29season not over yet

What these dates mean

June 28 is the cautious spring date for the Ely area; with only a 10% chance that a light frost will occur later, a gardener can plan to set out tender crops on that day. The earlier date, May 29, carries a 90% chance of frost and therefore is a gamble, while the median June 12 carries a 50% chance of a light frost later.

In the fall the cautious date is August 31, when there is only a 10% chance that a light frost has already arrived, making it the latest reliable day to finish harvesting tender crops; September 26 is a gamble with a 90% chance of frost, and September 13 carries a 50% chance of a light frost earlier. The 50% hard-frost dates are May 31 in spring and September 23 in fall; a hard frost at 28°F can damage plants that would survive a light frost at 32°F.

How to read the probabilities

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

  • Spring: "10% after June 28" 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 August 31" 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 Ely, NVNumbered nearest stations: 1 — McGill, NV — 9 mi; 2 — Eskdale, UT — 50 mi; 3 — Lages, NV — 54 mi; 4 — Partoun, UT — 56 mi; 5 — Eureka, NV — 61 mi.NV25 mi · 40 km1. McGill, NV — 9 mi12. Eskdale, UT — 50 mi23. Lages, NV — 54 mi34. Partoun, UT — 56 mi45. Eureka, NV — 61 mi5
  1. McGill, NV 9 mi (15 km)
  2. Eskdale, UT 50 mi (80 km)
  3. Lages, NV 54 mi (88 km)
  4. Partoun, UT 56 mi (91 km)
  5. Eureka, NV 61 mi (99 km)

Sources

* Hardiness zone 5b: zone derived from PRISM 2023 grid at the station location (not the official USDA map). Source data: PRISM Group, Oregon State University.

Station coordinates: 39.2953, -114.8467.