Checking current alerts… View NWS forecast and alerts.
Will it freeze in Chambersburg in the next 7 nights?
No overnight lows at or below 32°F are forecast in Chambersburg during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 53°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM EST to Fri, Nov 6, 6:00 AM EST.
4 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 53°F Above 36°F · Mostly Cloudy then Patchy Fog
- Fri, Nov 6 43°F Above 36°F · Mostly Cloudy
- Sat, Nov 7 39°F Above 36°F · Mostly Cloudy
- Sun, Nov 8 36°F Frost possible · Mostly Clear
- Mon, Nov 9 35°F Frost possible · Mostly Clear
- Tue, Nov 10 36°F Frost possible · Mostly Clear
- Wed, Nov 11 34°F Frost possible · Partly Cloudy
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 Chambersburg
The median first fall hard-freeze date (28°F) is November 6, from NOAA’s 1991–2020 Climate Normals at Chambersburg 1 Ese. 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 16 · Apr 30 · May 17 | Oct 1 · Oct 14 · Oct 28 | 165 days |
| 32°F freeze | Apr 3 · Apr 18 · May 5 | Oct 10 · Oct 25 · Nov 8 | 188 days |
| 28°F hard freeze | Mar 21 · Apr 4 · Apr 21 | Oct 23 · Nov 6 · Nov 21 | 213 days |
Average high temperature by month
1991–2020 normals at Chambersburg 1 Ese
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 Chambersburg, PA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Chambersburg 1 Ese (station USC00361354, elevation 640 ft), 0.9 mi from Chambersburg. 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 Chambersburg
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Shippensburg, PA | 11 mi | Apr 19 | Oct 24 |
| Waynesboro, PA | 13 mi | Apr 25 | Oct 19 |
| Hagerstown, MD | 21 mi | Apr 11 | Oct 28 |
| Gettysburg, PA | 24 mi | Apr 24 | Oct 21 |
| Thurmont, MD | 25 mi | Apr 14 | Oct 30 |
| Carlisle, PA | 30 mi | Apr 23 | Oct 18 |
| Taneytown, MD | 32 mi | Apr 22 | Oct 20 |
| Middletown, MD | 34 mi | Apr 2 | Nov 6 |
| Walkersville, MD | 35 mi | Apr 2 | Nov 6 |
| Frederick, MD | 37 mi | Apr 2 | Nov 6 |
Frequently asked questions
When is the last frost in Chambersburg?
On average, the last spring frost (32°F) in Chambersburg is around April 18. In about 1 year in 10 it comes after May 5, and in 9 years in 10 it comes after April 3.
When is the first frost in Chambersburg?
The first fall frost (32°F) usually arrives around October 25. There’s a 10% chance of a freeze by October 10 and a 90% chance by November 8.
Can it frost in Chambersburg 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 April 30.
What growing zone is Chambersburg?
Chambersburg is in USDA Plant Hardiness Zone 7a (average annual extreme minimum temperature 0 to 5°F), based on the 2023 USDA map for ZIP code 17202. See growing zones in Pennsylvania.
More: all Pennsylvania frost dates · Pennsylvania growing zones · frost vs. freeze