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Will it freeze in Morris Plains in the next 7 nights?
No overnight lows at or below 32°F are forecast in Morris Plains during the next 7 nights in the available NWS frost forecast.
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.
1 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
- Fri, Nov 6 50°F Above 36°F · Partly Cloudy
- Sat, Nov 7 43°F Above 36°F · Slight Chance Light Rain
- Sun, Nov 8 40°F Above 36°F · Mostly Clear
- Mon, Nov 9 38°F Above 36°F · Mostly Clear
- Tue, Nov 10 39°F Above 36°F · Mostly Clear
- Wed, Nov 11 35°F Frost possible · Mostly Clear
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 Morris Plains
The median first fall hard-freeze date (28°F) is November 2, from NOAA’s 1991–2020 Climate Normals at Boonton 1 SE. 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 17 · May 1 · May 18 | Oct 1 · Oct 12 · Oct 29 | 166 days |
| 32°F freeze | Apr 4 · Apr 17 · May 5 | Oct 8 · Oct 23 · Nov 6 | 189 days |
| 28°F hard freeze | Mar 21 · Apr 4 · Apr 18 | Oct 19 · Nov 2 · Nov 17 | 212 days |
Average high temperature by month
1991–2020 normals at Boonton 1 SE
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 Morris Plains, NJ come from the nearest weather station with freeze statistics in NOAA’s 1991–2020 Climate Normals: Boonton 1 SE (station USC00280907, elevation 280 ft), 5.5 mi from Morris Plains. 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 Morris Plains
| City | Distance | Last spring frost | First fall frost |
|---|---|---|---|
| Morristown, NJ | 3.1 mi | Apr 18 | Oct 27 |
| Rockaway, NJ | 4.3 mi | Apr 17 | Oct 23 |
| Dover, NJ | 5.6 mi | Apr 17 | Oct 23 |
| Boonton, NJ | 5.6 mi | Apr 17 | Oct 23 |
| Florham Park, NJ | 6.2 mi | Apr 18 | Oct 27 |
| Madison, NJ | 6.2 mi | Apr 18 | Oct 27 |
| Wharton, NJ | 6.8 mi | Apr 17 | Oct 23 |
| Chatham, NJ | 8.1 mi | Apr 18 | Oct 27 |
| Roseland, NJ | 8.7 mi | Apr 18 | Oct 24 |
| Bernardsville, NJ | 9.9 mi | Apr 26 | Oct 18 |
Frequently asked questions
When is the last frost in Morris Plains?
On average, the last spring frost (32°F) in Morris Plains is around April 17. In about 1 year in 10 it comes after May 5, and in 9 years in 10 it comes after April 4.
When is the first frost in Morris Plains?
The first fall frost (32°F) usually arrives around October 23. There’s a 10% chance of a freeze by October 8 and a 90% chance by November 6.
Can it frost in Morris Plains 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 1.
What growing zone is Morris Plains?
Morris Plains 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 07950. See growing zones in New Jersey.
More: all New Jersey frost dates · New Jersey growing zones · frost vs. freeze