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Will it freeze in Algona in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Tonight: 32°F (Thu, Nov 5, 6:00 PM CST to Fri, Nov 6, 6:00 AM CST).
Tonight: forecast low 32°F. Freeze.
NWS forecast period: Thu, Nov 5, 6:00 PM CST to Fri, Nov 6, 6:00 AM CST.
4 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 32°F Freeze · Mostly Cloudy
- Fri, Nov 6 26°F Hard freeze · Partly Cloudy
- Sat, Nov 7 34°F Frost possible · Partly Cloudy
- Sun, Nov 8 36°F Frost possible · Mostly Clear
- Mon, Nov 9 37°F Above 36°F · Mostly Clear
- Tue, Nov 10 37°F Above 36°F · Mostly Cloudy
- Wed, Nov 11 38°F Above 36°F · Mostly Clear
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 Algona
The median first fall hard-freeze date (28°F) is October 18, from NOAA’s 1991–2020 Climate Normals at Algona. This is the 50% probability date, not a forecast for this year.
| Temperature | Last 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 | Apr 28 · May 9 · May 20 | Sep 16 · Sep 28 · Oct 10 | 142 days |
| 32°F freeze | Apr 16 · Apr 30 · May 11 | Sep 23 · Oct 6 · Oct 20 | 160 days |
| 28°F hard freeze | Apr 4 · Apr 20 · May 2 | Oct 2 · Oct 18 · Nov 1 | 180 days |
Average high temperature by month
1991–2020 normals at Algona
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 Algona, IA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Algona (station USC00130133, elevation 1,214 ft), 0.9 mi from Algona. 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 Algona
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Estherville, IA | 38 mi | May 2 | Oct 3 |
| Fort Dodge, IA | 39 mi | Apr 28 | Oct 8 |
| Fairmont, MN | 41 mi | Apr 25 | Oct 14 |
| Clear Lake, IA | 43 mi | May 3 | Oct 1 |
| Spencer, IA | 47 mi | May 1 | Oct 3 |
| Webster City, IA | 47 mi | May 3 | Oct 2 |
| Spirit Lake, IA | 50 mi | Apr 28 | Oct 11 |
| Mason City, IA | 52 mi | Apr 29 | Oct 7 |
| Storm Lake, IA | 57 mi | Apr 25 | Oct 13 |
| Albert Lea, MN | 59 mi | Apr 27 | Oct 9 |
Frequently asked questions
When is the last frost in Algona?
On average, the last spring frost (32°F) in Algona is around April 30. In about 1 year in 10 it comes after May 11, and in 9 years in 10 it comes after April 16.
When is the first frost in Algona?
The first fall frost (32°F) usually arrives around October 6. There’s a 10% chance of a freeze by September 23 and a 90% chance by October 20.
Can it frost in Algona 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 9.
What growing zone is Algona?
Algona is in USDA Plant Hardiness Zone 5a (average annual extreme minimum temperature −20 to −15°F), based on the 2023 USDA map for ZIP code 50511. See growing zones in Iowa.
More: all Iowa frost dates · Iowa growing zones · frost vs. freeze