Checking current alerts… View NWS forecast and alerts.
Will it freeze in Lewisburg in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Wed, Nov 11: 31°F (Wed, Nov 11, 6:00 PM EST to Thu, Nov 12, 6:00 AM EST).
Tonight: forecast low 50°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 50°F Above 36°F · Mostly Cloudy then Patchy Fog
- Fri, Nov 6 43°F Above 36°F · Mostly Cloudy
- Sat, Nov 7 40°F Above 36°F · Chance Light Rain then Mostly Cloudy
- Sun, Nov 8 36°F Frost possible · Mostly Clear
- Mon, Nov 9 34°F Frost possible · Mostly Clear
- Tue, Nov 10 34°F Frost possible · Mostly Clear
- Wed, Nov 11 31°F Freeze · 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 Lewisburg
The median first fall hard-freeze date (28°F) is November 1, from NOAA’s 1991–2020 Climate Normals at Lewisburg. 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 23 · May 6 · May 21 | Sep 25 · Oct 7 · Oct 21 | 154 days |
| 32°F freeze | Apr 13 · Apr 26 · May 11 | Oct 5 · Oct 20 · Nov 1 | 176 days |
| 28°F hard freeze | Mar 31 · Apr 14 · Apr 28 | Oct 17 · Nov 1 · Nov 13 | 200 days |
Average high temperature by month
1991–2020 normals at Lewisburg
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 Lewisburg, PA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Lewisburg (station USC00364976, elevation 500 ft), 1.3 mi from Lewisburg. 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 Lewisburg
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Milton, PA | 3.1 mi | Apr 26 | Oct 20 |
| Sunbury, PA | 8.7 mi | Apr 30 | Oct 13 |
| Selinsgrove, PA | 11 mi | Apr 25 | Oct 22 |
| South Williamsport, PA | 19 mi | Apr 25 | Oct 24 |
| Williamsport, PA | 21 mi | Apr 25 | Oct 24 |
| Shamokin, PA | 21 mi | Apr 27 | Oct 20 |
| Bloomsburg, PA | 23 mi | Apr 27 | Oct 20 |
| Mount Carmel, PA | 27 mi | Apr 27 | Oct 20 |
| Lock Haven, PA | 32 mi | Apr 30 | Oct 20 |
| Berwick, PA | 34 mi | May 4 | Oct 11 |
Frequently asked questions
When is the last frost in Lewisburg?
On average, the last spring frost (32°F) in Lewisburg is around April 26. In about 1 year in 10 it comes after May 11, and in 9 years in 10 it comes after April 13.
When is the first frost in Lewisburg?
The first fall frost (32°F) usually arrives around October 20. There’s a 10% chance of a freeze by October 5 and a 90% chance by November 1.
Can it frost in Lewisburg 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 6.
What growing zone is Lewisburg?
Lewisburg 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 17850. See growing zones in Pennsylvania.
More: all Pennsylvania frost dates · Pennsylvania growing zones · frost vs. freeze