U.S. Frost Dates by Weather Station

NOAA station USW00013997 · Missouri

Frost Dates for Vichy Rolla National Airport, MO

NOAA weather station Vichy Rolla National Airport (USW00013997), Missouri · elevation 1127 ft (344 m) · hardiness zone 6b*

  • Lower-risk planting dateafter April 30only 1 spring in 10 still has a frost later
  • Typical last frostApril 1250% chance of a frost after it
  • Typical first fall frostOctober 2550% chance of a frost before it
  • Frost-free season194 daystypical year, 32°F
  • Hardiness zone6bcalculated*

The year at a glance

Frost season at Vichy Rolla National Airport, MOSpring: a frost after March 26 in 9 years out of 10, after April 12 in half of the years, after April 30 in 1 year out of 10. Fall: the first frost comes before October 11 in 1 year out of 10, before October 25 in half of the years, before November 5 in 9 years out of 10. Typical frost-free season: 194 days.JanFebMarAprMayJunJulAugSepOctNovDecLast frost ~Apr 12First frost ~Oct 25Frost season at Vichy Rolla National Airport, MOSpring: a frost after March 26 in 9 years out of 10, after April 12 in half of the years, after April 30 in 1 year out of 10. Fall: the first frost comes before October 11 in 1 year out of 10, before October 25 in half of the years, before November 5 in 9 years out of 10. Typical frost-free season: 194 days.JFMAMJJASONDLast frost ~Apr 12First frost ~Oct 25
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.Today

Frost dates (32°F)

Probability of frost, based on 30 years of NOAA records (1991–2020 normals)
ChanceLast frost in spring afterFirst frost in fall before
10% (unlikely)April 30October 11
50% (typical)April 12October 25
90% (likely)March 26November 5
Frost-free season (32°F, 50% chance)
194 days
Hard frost (28°F), last in spring, 50% chance after
March 31
Hard frost (28°F), first in fall, 50% chance before
November 2

The last 15 years (2006–2020 normals)

Typical last frost April 13 (1 day later than the 30-year normal), typical first fall frost October 24 (1 day earlier). Frost-free season 192 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 Vichy Rolla National Airport: chance of a frost after this dateSpring, chance of a frost after the date: 10% April 30, 20% April 24, 30% April 20, 40% April 16, 50% April 12, 60% April 9, 70% April 5, 80% April 1, 90% March 26. Observed last spring frost in recent years: 2021 April 22, 2022 April 19, 2023 April 24, 2024 April 22, 2025 April 8, 2026 March 28.Spring: last frostChance of a frost after this date10%50%90%Apr 1May 1Apr 30Apr 12Mar 262021: April 222022: April 192023: April 242024: April 222025: April 82026: March 28Fall at Vichy Rolla National Airport: chance of a frost before this dateFall, chance of a frost before the date: 10% October 11, 20% October 16, 30% October 19, 40% October 22, 50% October 25, 60% October 27, 70% October 30, 80% November 1, 90% November 5. Observed first fall frost in recent years: 2021 November 3, 2022 October 8, 2023 October 30, 2024 October 16, 2025 November 9.Fall: first frostChance of a frost before this date10%50%90%Oct 1Nov 1Oct 11Oct 25Nov 52021: November 32022: October 82023: October 302024: October 162025: November 9
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
2021April 22November 3
2022April 19October 8
2023April 24October 30
2024April 22October 16
2025April 8November 9
2026March 28season not over yet

What these dates mean

The 194 days separating the 50% dates of April 12 and October 25 at Vichy Rolla National Airport encompass the interval where a light frost is as likely as not, giving gardeners a clear window for frost-less activity. The 50% dates themselves mean a gardener can expect an even chance of a 32 °F frost on each side of those days.

For a cautious spring plan, the date with a 10 % chance of a later frost is April 30, which gardeners use when setting out tender crops. In the fall, the cautious date with a 10 % chance of an earlier frost is October 11, marking the point to finish harvesting tender crops. The 50% dates for hard frost are March 31 in spring and November 2 in fall, showing when a 28 °F frost becomes a coin-flip.

A hard frost at 28 °F can damage plants that survive a light frost at 32 °F, so it is a more critical threshold for gardeners.

How to read the probabilities

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

  • Spring: "10% after April 30" 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 11" 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 Vichy Rolla National Airport, MONumbered nearest stations: 1 — near Rolla, MO — 12 mi; 2 — Freedom, MO — 23 mi; 3 — Rosebud, MO — 31 mi; 4 — Waynesville, MO — 33 mi; 5 — Salem, MO — 37 mi.25 mi · 40 km1. near Rolla, MO — 12 mi12. Freedom, MO — 23 mi23. Rosebud, MO — 31 mi34. Waynesville, MO — 33 mi45. Salem, MO — 37 mi5
  1. near Rolla, MO 12 mi (19 km)
  2. Freedom, MO 23 mi (37 km)
  3. Rosebud, MO 31 mi (49 km)
  4. Waynesville, MO 33 mi (54 km)
  5. Salem, MO 37 mi (59 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: 38.1311, -91.7683.