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Will it freeze in Junction City in the next 7 nights?
No overnight lows at or below 32°F are forecast in Junction City during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 38°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM PST to Fri, Nov 6, 6:00 AM PST.
No nights at or below 36°F in the National Weather Service forecast for the next 7 nights.
- Tonight 38°F Above 36°F · Patchy Fog then Partly Cloudy
- Fri, Nov 6 41°F Above 36°F · Slight Chance Light Rain then Mostly Cloudy
- Sat, Nov 7 46°F Above 36°F · Light Rain
- Sun, Nov 8 39°F Above 36°F · Mostly Cloudy
- Mon, Nov 9 44°F Above 36°F · Chance Light Rain
- Tue, Nov 10 45°F Above 36°F · Chance Light Rain
- Wed, Nov 11 43°F Above 36°F · Chance Light Rain
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 Junction City
The median first fall hard-freeze date (28°F) is November 11, from NOAA’s 1991–2020 Climate Normals at Eugene Mahlon Sweet Airport. 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 24 · May 15 · Jun 8 | Sep 18 · Oct 7 · Oct 24 | 144 days |
| 32°F freeze | Mar 15 · Apr 11 · May 9 | Oct 6 · Oct 23 · Nov 13 | 196 days |
| 28°F hard freeze | Feb 2 · Mar 3 · Mar 30 | Oct 20 · Nov 11 · Dec 12 | 252 days |
Average high temperature by month
1991–2020 normals at Eugene Mahlon Sweet Airport
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 Junction City, OR come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Eugene Mahlon Sweet Airport (station USW00024221, elevation 353 ft), 5.9 mi from Junction City. 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 Junction City
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Eugene, OR | 11 mi | Apr 11 | Oct 23 |
| Veneta, OR | 14 mi | Apr 18 | Oct 25 |
| Springfield, OR | 16 mi | Apr 11 | Oct 23 |
| Creswell, OR | 22 mi | Apr 24 | Oct 25 |
| Philomath, OR | 24 mi | May 15 | Oct 8 |
| Corvallis, OR | 25 mi | Apr 17 | Oct 28 |
| Lebanon, OR | 26 mi | Mar 14 | Nov 18 |
| Sweet Home, OR | 28 mi | Apr 12 | Oct 28 |
| Albany, OR | 29 mi | Apr 17 | Oct 28 |
| Cottage Grove, OR | 30 mi | Apr 24 | Oct 25 |
Frequently asked questions
When is the last frost in Junction City?
On average, the last spring frost (32°F) in Junction City is around April 11. In about 1 year in 10 it comes after May 9, and in 9 years in 10 it comes after March 15.
When is the first frost in Junction City?
The first fall frost (32°F) usually arrives around October 23. There’s a 10% chance of a freeze by October 6 and a 90% chance by November 13.
Can it frost in Junction City 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 15.
What growing zone is Junction City?
Junction City is in USDA Plant Hardiness Zone 8b (average annual extreme minimum temperature 15 to 20°F), based on the 2023 USDA map for ZIP code 97448. See growing zones in Oregon.
More: all Oregon frost dates · Oregon growing zones · frost vs. freeze