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Will it freeze in Mount Joy in the next 7 nights?
No overnight lows at or below 32°F are forecast in Mount Joy during the next 7 nights in the available NWS frost forecast.
Tonight: forecast low 57°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM EST to Fri, Nov 6, 6:00 AM EST.
1 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 57°F Above 36°F · Light Rain Likely
- Fri, Nov 6 46°F Above 36°F · Partly Cloudy
- Sat, Nov 7 40°F Above 36°F · Partly Cloudy
- Sun, Nov 8 38°F Above 36°F · Mostly Clear
- Mon, Nov 9 37°F Above 36°F · Mostly Clear
- Tue, Nov 10 37°F Above 36°F · 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 Mount Joy
The median first fall hard-freeze date (28°F) is October 24, from NOAA’s 1991–2020 Climate Normals at Landisville 2 NW. 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 22 | Sep 19 · Sep 30 · Oct 12 | 143 days |
| 32°F freeze | Apr 16 · Apr 30 · May 13 | Sep 29 · Oct 10 · Oct 26 | 162 days |
| 28°F hard freeze | Apr 5 · Apr 18 · May 2 | Oct 8 · Oct 24 · Nov 5 | 186 days |
Average high temperature by month
1991–2020 normals at Landisville 2 NW
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 Mount Joy, PA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Landisville 2 NW (station USC00364778, elevation 360 ft), 4.2 mi from Mount Joy. 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 Mount Joy
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Columbia, PA | 5.0 mi | Apr 30 | Oct 10 |
| Elizabethtown, PA | 5.6 mi | Apr 9 | Nov 2 |
| Millersville, PA | 11 mi | Apr 19 | Oct 24 |
| Lititz, PA | 11 mi | Apr 18 | Oct 25 |
| Lancaster, PA | 12 mi | Apr 19 | Oct 24 |
| Middletown, PA | 13 mi | Apr 9 | Nov 2 |
| Palmyra, PA | 14 mi | Apr 20 | Oct 25 |
| Red Lion, PA | 16 mi | Apr 26 | Oct 19 |
| York, PA | 16 mi | Apr 26 | Oct 19 |
| Lebanon, PA | 17 mi | Apr 20 | Oct 25 |
Frequently asked questions
When is the last frost in Mount Joy?
On average, the last spring frost (32°F) in Mount Joy is around April 30. In about 1 year in 10 it comes after May 13, and in 9 years in 10 it comes after April 16.
When is the first frost in Mount Joy?
The first fall frost (32°F) usually arrives around October 10. There’s a 10% chance of a freeze by September 29 and a 90% chance by October 26.
Can it frost in Mount Joy 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 Mount Joy?
Mount Joy 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 17552. See growing zones in Pennsylvania.
More: all Pennsylvania frost dates · Pennsylvania growing zones · frost vs. freeze