Frost dates for 08094Williamstown, NJ
The average last spring frost in Williamstown is April 14 and the average first fall frost is October 27, giving a typical growing season of about 196 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 14
- Average first fall frost
- Oct 27
- Growing season
- 196 days
Safer after Apr 27 (1-in-10 risk)
Possible by Oct 13 (1-in-10 risk)
Last frost typically in 162 days
Frost risk by date
NOAA reports frost dates as probabilities. The middle date is the average (a 50% chance). For spring, the 10% date is a safer planting date: frost after it happens in about 1 year in 10. Light frost (36°F) can damage tender plants; a hard freeze (28°F) kills most annuals.
| Temperature | Last spring: 90% / 50% / 10% chance | First fall: 10% / 50% / 90% chance | Growing season (50%) | Years with at least one |
|---|---|---|---|---|
| Light frost (36°F) | Apr 13 · Apr 27 · May 12 | Oct 5 · Oct 16 · Oct 31 | 172 days | 100% |
| Frost / freeze (32°F) | Apr 1 · Apr 14 · Apr 27 | Oct 13 · Oct 27 · Nov 8 | 196 days | 100% |
| Hard freeze (28°F) | Mar 21 · Apr 2 · Apr 16 | Oct 24 · Nov 5 · Nov 19 | 217 days | 100% |
Planting calendar for Williamstown
Planting windows from the University of Maryland Extension calendar, shifted to your average frost dates. Use them as a starting point and adjust for seed packet instructions and local conditions.
| Crop | Task | Window |
|---|---|---|
| Tomatoes | Start seeds indoors | Mar 14 – May 20 |
| Tomatoes | Transplant outdoors | Apr 30 – Jul 7 |
| Peppers | Start seeds indoors | Mar 14 – Apr 14 |
| Peppers | Transplant outdoors | May 14 – Jun 14 |
| Eggplant | Start seeds indoors | Mar 31 – Apr 29 |
| Eggplant | Transplant outdoors | May 14 – Jun 14 |
| Cucumbers | Sow outdoors | May 14 – Jul 17 |
| Summer squash | Sow outdoors | Apr 30 – Jun 14 |
| Winter squash & pumpkins | Sow outdoors | May 14 – Jun 14 |
| Snap beans | Sow outdoors | Apr 30 – Aug 9 |
| Sweet corn | Sow outdoors | Apr 30 – Jul 7 |
| Watermelon & cantaloupe | Sow outdoors | May 14 – Jun 14 |
| Okra | Sow outdoors | May 7 – May 30 |
| Peas | Sow outdoors (spring) | Mar 14 – Apr 29 |
| Potatoes | Plant outdoors (spring) | Mar 14 – May 14 |
| Onions | Start seeds indoors (spring) | Jan 31 – Feb 27 |
| Onions | Transplant outdoors (spring) | Mar 31 – Apr 29 |
| Broccoli | Start seeds indoors (spring) | Feb 24 – Mar 30 |
| Broccoli | Transplant outdoors (spring) | Mar 31 – Apr 29 |
| Broccoli | Start seeds indoors (fall) | Jun 27 – Jul 7 |
| Broccoli | Transplant outdoors (fall) | Jul 27 – Aug 7 |
| Cabbage | Start seeds indoors (spring) | Feb 14 – Mar 14 |
| Cabbage | Transplant outdoors (spring) | Mar 14 – Apr 14 |
| Cabbage | Start seeds indoors (fall) | Jun 17 – Jul 17 |
| Cabbage | Transplant outdoors (fall) | Jul 17 – Aug 17 |
| Leaf lettuce | Sow outdoors (spring) | Mar 14 – May 30 |
| Leaf lettuce | Sow outdoors (fall) | Jul 17 – Sep 2 |
| Spinach | Sow outdoors (spring) | Mar 7 – Apr 20 |
| Spinach | Sow outdoors (fall) | Aug 3 – Sep 7 |
| Radishes | Sow outdoors (spring) | Mar 14 – May 4 |
| Radishes | Sow outdoors (fall) | Jul 17 – Sep 17 |
| Kale | Sow outdoors (spring) | Mar 31 – Apr 20 |
| Kale | Sow outdoors (fall) | Jul 10 – Aug 17 |
| Carrots | Sow outdoors (spring) | Apr 14 – May 30 |
| Carrots | Sow outdoors (fall) | Jun 17 – Aug 2 |
| Garlic | Plant outdoors (fall) | Oct 17 – Nov 17 |
Where these dates come from
ZIP code 08094 is matched to the NOAA station Hammonton 1 Ne, NJ, 14.4 km away, at 125 ft elevation (13 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Hammonton 1 Ne, NJ (used) | 125 ft | Apr 14 | Oct 27 |
| Glassboro 2 Ne, NJ | 100 ft | Apr 8 | Nov 1 |
| Woodstown Pittsgrov 4E, NJ | 98 ft | Apr 11 | Nov 3 |
| Indian Mills 2 W, NJ | 100 ft | Apr 28 | Oct 15 |
Frost dates near Williamstown
- Sicklerville, NJ 08081 · last Apr 14, first Oct 27
- Franklinville, NJ 08322 · last Apr 14, first Oct 27
- Cedar Brook, NJ 08018 · last Apr 14, first Oct 27
- Winslow, NJ 08095 · last Apr 14, first Oct 27
- Deptford, NJ 08096 · last Apr 28, first Oct 15
- Clayton, NJ 08312 · last Apr 10, first Nov 1
- Waterford Works, NJ 08089 · last Apr 14, first Oct 27
- Malaga, NJ 08328 · last Apr 10, first Nov 1
Frequently asked questions
- When is the last frost in Williamstown, NJ?
- For ZIP code 08094, the average last spring frost (32°F) is April 14, based on NOAA 1991-2020 climate normals for the Hammonton 1 Ne, NJ weather station. There is a 1-in-10 chance of a frost after April 27.
- When is the first frost in Williamstown, NJ?
- The average first fall frost (32°F) is October 27. There is a 1-in-10 chance of frost by October 13, so tender plants are at risk from that point on.
- How long is the growing season in 08094?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 196 days long.
- Are these frost dates a forecast?
- No. They are 30-year averages and probabilities from NOAA weather station records. Use them to plan, then watch your local forecast before planting tender crops or leaving them uncovered.