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Will it freeze in Collegeville in the next 7 nights?
The earliest overnight low at or below 32°F in the available NWS frost forecast is Wed, Nov 11: 32°F (Wed, Nov 11, 6:00 PM EST to Thu, Nov 12, 6:00 AM EST).
Tonight: forecast low 60°F. Above 36°F.
NWS forecast period: Thu, Nov 5, 6:00 PM EST to Fri, Nov 6, 6:00 AM EST.
3 of the next 7 nights are forecast at 36°F or colder, cold enough for frost on exposed plants.
- Tonight 60°F Above 36°F · Light Rain Likely
- Fri, Nov 6 47°F Above 36°F · Partly Cloudy
- Sat, Nov 7 40°F Above 36°F · Partly Cloudy
- Sun, Nov 8 37°F Above 36°F · Mostly Clear
- Mon, Nov 9 35°F Frost possible · Mostly Clear
- Tue, Nov 10 36°F Frost possible · Mostly Clear
- Wed, Nov 11 32°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 Collegeville
The median first fall hard-freeze date (28°F) is October 27, from NOAA’s 1991–2020 Climate Normals at Graterford 1 E. 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 21 · May 4 · May 21 | Sep 21 · Oct 4 · Oct 18 | 151 days |
| 32°F freeze | Apr 10 · Apr 24 · May 9 | Oct 1 · Oct 15 · Nov 1 | 173 days |
| 28°F hard freeze | Mar 28 · Apr 10 · Apr 27 | Oct 10 · Oct 27 · Nov 12 | 198 days |
Average high temperature by month
1991–2020 normals at Graterford 1 E
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 Collegeville, PA come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Graterford 1 E (station USC00363437, elevation 279 ft), 3.4 mi from Collegeville. 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 Collegeville
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Phoenixville, PA | 5.0 mi | Apr 18 | Oct 27 |
| Norristown, PA | 7.5 mi | Apr 8 | Oct 31 |
| Bridgeport, PA | 8.1 mi | Apr 8 | Oct 31 |
| Lansdale, PA | 9.9 mi | Apr 11 | Nov 1 |
| Pottstown, PA | 11 mi | Apr 20 | Oct 23 |
| Conshohocken, PA | 11 mi | Apr 8 | Oct 31 |
| Souderton, PA | 11 mi | Apr 26 | Oct 17 |
| Ambler, PA | 12 mi | Apr 11 | Nov 1 |
| Perkasie, PA | 16 mi | Apr 26 | Oct 17 |
| West Chester, PA | 17 mi | Apr 26 | Oct 18 |
Frequently asked questions
When is the last frost in Collegeville?
On average, the last spring frost (32°F) in Collegeville is around April 24. In about 1 year in 10 it comes after May 9, and in 9 years in 10 it comes after April 10.
When is the first frost in Collegeville?
The first fall frost (32°F) usually arrives around October 15. There’s a 10% chance of a freeze by October 1 and a 90% chance by November 1.
Can it frost in Collegeville 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 4.
What growing zone is Collegeville?
Collegeville 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 19426. See growing zones in Pennsylvania.
More: all Pennsylvania frost dates · Pennsylvania growing zones · frost vs. freeze