U.S. Frost Dates by Weather Station

NOAA station USC00262431 · Nevada

Frost Dates for Dyer, NV

NOAA weather station Dyer 5 S (USC00262431), Nevada · elevation 4900 ft (1494 m) · hardiness zone 6b*

  • Lower-risk planting dateafter June 1only 1 spring in 10 still has a frost later
  • Typical last frostMay 950% chance of a frost after it
  • Typical first fall frostOctober 450% chance of a frost before it
  • Frost-free season147 daystypical year, 32°F
  • Hardiness zone6bcalculated*

The year at a glance

Frost season at Dyer, NVSpring: a frost after April 24 in 9 years out of 10, after May 9 in half of the years, after June 1 in 1 year out of 10. Fall: the first frost comes before September 22 in 1 year out of 10, before October 4 in half of the years, before October 17 in 9 years out of 10. Typical frost-free season: 147 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~May 9First frost ~Oct 4Frost season at Dyer, NVSpring: a frost after April 24 in 9 years out of 10, after May 9 in half of the years, after June 1 in 1 year out of 10. Fall: the first frost comes before September 22 in 1 year out of 10, before October 4 in half of the years, before October 17 in 9 years out of 10. Typical frost-free season: 147 days.JFMAMJJASONDLast frost ~May 9First frost ~Oct 4
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 1September 22
50% (typical)May 9October 4
90% (likely)April 24October 17
Frost-free season (32°F, 50% chance)
147 days
Hard frost (28°F), last in spring, 50% chance after
April 25
Hard frost (28°F), first in fall, 50% chance before
October 13

The last 15 years (2006–2020 normals)

Typical last frost May 10 (1 day later than the 30-year normal), typical first fall frost October 5 (1 day later). Frost-free season 148 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 Dyer: chance of a frost after this dateSpring, chance of a frost after the date: 10% June 1, 20% May 25, 30% May 19, 40% May 14, 50% May 9, 60% May 5, 70% May 2, 80% April 29, 90% April 24.Spring: last frostChance of a frost after this date10%50%90%May 1Jun 1Jun 1May 9Apr 24Fall at Dyer: chance of a frost before this dateFall, chance of a frost before the date: 10% September 22, 20% September 26, 30% September 28, 40% October 1, 50% October 4, 60% October 6, 70% October 9, 80% October 12, 90% October 17.Fall: first frostChance of a frost before this date10%50%90%Oct 1Sep 22Oct 4Oct 17
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.

What these dates mean

Planting tender crops on April 24 in Dyer carries a 90% chance of a light frost later that season, making it a gamble for spring growers. The cautious approach waits until the June 1 date, when only a 10% chance of a frost later remains, providing a lower-risk window for setting out those sensitive plants.

The 50% dates—May 9 for spring and October 4 for fall—are the points where a light frost has a 50% probability; they are not frost dates themselves. For a conservative season, the fall cautious date is September 22, which holds only a 10% chance that a frost has arrived earlier. A hard frost at 28 °F, recorded with median dates of April 25 in spring and October 13 in fall, can damage plants more severely than a light frost at 32 °F, so its timing matters even more for protecting tender crops.

How to read the probabilities

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

  • Spring: "10% after June 1" 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 22" 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 Dyer, NVNumbered nearest stations: 1 — Bishop, CA — 25 mi; 2 — Tonopah, NV — 58 mi; 3 — Lee Vining, CA — 66 mi; 4 — Lodgepole, CA — 80 mi; 5 — Auberry, CA — 90 mi.CANV25 mi · 40 km1. Bishop, CA — 25 mi12. Tonopah, NV — 58 mi23. Lee Vining, CA — 66 mi34. Lodgepole, CA — 80 mi45. Auberry, CA — 90 mi5
  1. Bishop, CA 25 mi (41 km)
  2. Tonopah, NV 58 mi (94 km)
  3. Lee Vining, CA 66 mi (106 km)
  4. Lodgepole, CA 80 mi (129 km)
  5. Auberry, CA 90 mi (145 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: 37.6064, -118.