Frost dates 2026–2027

Frost dates for Sandpoint, Idaho

Median (50% chance) dates of the last and first 32°F frost, from NOAA 1991–2020 climate normals at Sandpoint Experiment Station, 0.9 mi away (close match).

Last spring frostMay 8
First fall frostSep 28
141 frost-free days
Last spring frostMay 81 year in 10 after May 25
First fall frostSep 281 year in 10 by Sep 11
Growing season141 daysbetween median 32°F dates
Hardiness zoneZone 6b−5 to 0°F average extreme low

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Will it freeze in Sandpoint in the next 7 nights?

No overnight lows at or below 32°F are forecast in Sandpoint during the next 7 nights in the available NWS frost forecast.

Tonight: forecast low 35°F. Frost possible.

NWS forecast period: Thu, Nov 5, 6:00 PM PST to Fri, Nov 6, 6:00 AM PST.

2 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.

Overnight lows from the National Weather Service forecast for this location. This covers the available forecast window, not the first freeze of the whole season. Frost can form above 32°F on clear, calm nights.

Frost and freeze probabilities

Freeze dates shift from year to year. Spring percentages describe the chance of a freeze after the stated date; fall percentages describe the chance of a freeze by that date. The 10% spring date is the cautious one: a later freeze happens about 1 year in 10.

These dates describe historical probabilities, not this year’s forecast or the earliest and latest possible freezes. Different weather stations or probability thresholds can produce different published dates for the same city.

Average first hard freeze in Sandpoint

The median first fall hard-freeze date (28°F) is October 10, from NOAA’s 1991–2020 Climate Normals at Sandpoint Experiment Station. This is the 50% probability date, not a forecast for this year.

TemperatureLast spring date
90% · 50% · 10% chance of a later freeze
First fall date
10% · 50% · 90% chance of an earlier freeze
Season
36°F frost possible May 11 · May 28 · Jun 17 Sep 1 · Sep 13 · Sep 27 109 days
32°F freeze Apr 23 · May 8 · May 25 Sep 11 · Sep 28 · Oct 11 141 days
28°F hard freeze Mar 31 · Apr 21 · May 7 Sep 25 · Oct 10 · Oct 29 172 days
NOAA NCEI U.S. Climate Normals 1991–2020, station USC00108137. How to read these probabilities.

Average high temperature by month

1991–2020 normals at Sandpoint Experiment Station

Average low temperature by month

Months with lows near or below freezing carry frost risk

Where these frost dates come from

The frost dates for Sandpoint, ID come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Sandpoint Experiment Station (station USC00108137, elevation 2,126 ft), 0.9 mi from Sandpoint. Local conditions (valleys, hilltops, distance to water, city heat) can shift frost dates by days or weeks. The hardiness zone is from the 2023 USDA Plant Hardiness Zone Map (USDA ARS and Oregon State University PRISM). See our methodology.

Frost dates near Sandpoint

CityDistanceLast spring frostFirst fall frost
Rathdrum, ID 37 mi Apr 22 Oct 18
Hayden, ID 37 mi Apr 22 Oct 18
Coeur d'Alene, ID 42 mi Apr 22 Oct 18
Post Falls, ID 42 mi Apr 22 Oct 18
Deer Park, WA 46 mi May 22 Sep 14
Liberty Lake, WA 49 mi Apr 26 Oct 15
Spokane Valley, WA 53 mi Apr 26 Oct 15
Spokane, WA 58 mi Apr 26 Oct 15
Colville, WA 64 mi May 2 Oct 2
Airway Heights, WA 65 mi Apr 26 Oct 12

Frequently asked questions

When is the last frost in Sandpoint?

On average, the last spring frost (32°F) in Sandpoint is around May 8. In about 1 year in 10 it comes after May 25, and in 9 years in 10 it comes after April 23.

When is the first frost in Sandpoint?

The first fall frost (32°F) usually arrives around September 28. There’s a 10% chance of a freeze by September 11 and a 90% chance by October 11.

Can it frost in Sandpoint after the last frost date?

Yes. Frost can form on clear, calm nights even when the air stays above 32°F. Temperatures of 36°F or lower, cold enough for frost on exposed plants, have a 50% chance of occurring after May 28.

What growing zone is Sandpoint?

Sandpoint is in USDA Plant Hardiness Zone 6b (average annual extreme minimum temperature −5 to 0°F), based on the 2023 USDA map for ZIP code 83852. See growing zones in Idaho.

More: all Idaho frost dates · Idaho growing zones · frost vs. freeze