Frost dates for 08028Glassboro, NJ
The average last spring frost in Glassboro is April 8 and the average first fall frost is November 1, giving a typical growing season of about 205 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 8
- Average first fall frost
- Nov 1
- Growing season
- 205 days
Safer after Apr 22 (1-in-10 risk)
Possible by Oct 18 (1-in-10 risk)
Last frost typically in 156 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 8 · Apr 22 · May 4 | Oct 9 · Oct 21 · Nov 2 | 182 days | 100% |
| Frost / freeze (32°F) | Mar 27 · Apr 8 · Apr 22 | Oct 18 · Nov 1 · Nov 15 | 205 days | 100% |
| Hard freeze (28°F) | Mar 12 · Mar 27 · Apr 9 | Oct 30 · Nov 11 · Nov 29 | 229 days | 100% |
Planting calendar for Glassboro
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 8 – May 14 |
| Tomatoes | Transplant outdoors | Apr 24 – Jul 12 |
| Peppers | Start seeds indoors | Mar 8 – Apr 8 |
| Peppers | Transplant outdoors | May 8 – Jun 8 |
| Eggplant | Start seeds indoors | Mar 25 – Apr 23 |
| Eggplant | Transplant outdoors | May 8 – Jun 8 |
| Cucumbers | Sow outdoors | May 8 – Jul 22 |
| Summer squash | Sow outdoors | Apr 24 – Jun 8 |
| Winter squash & pumpkins | Sow outdoors | May 8 – Jun 8 |
| Snap beans | Sow outdoors | Apr 24 – Aug 14 |
| Sweet corn | Sow outdoors | Apr 24 – Jul 12 |
| Watermelon & cantaloupe | Sow outdoors | May 8 – Jun 8 |
| Okra | Sow outdoors | May 1 – May 24 |
| Peas | Sow outdoors (spring) | Mar 8 – Apr 23 |
| Potatoes | Plant outdoors (spring) | Mar 8 – May 8 |
| Onions | Start seeds indoors (spring) | Jan 25 – Feb 21 |
| Onions | Transplant outdoors (spring) | Mar 25 – Apr 23 |
| Broccoli | Start seeds indoors (spring) | Feb 18 – Mar 24 |
| Broccoli | Transplant outdoors (spring) | Mar 25 – Apr 23 |
| Broccoli | Start seeds indoors (fall) | Jul 2 – Jul 12 |
| Broccoli | Transplant outdoors (fall) | Aug 1 – Aug 12 |
| Cabbage | Start seeds indoors (spring) | Feb 8 – Mar 8 |
| Cabbage | Transplant outdoors (spring) | Mar 8 – Apr 8 |
| Cabbage | Start seeds indoors (fall) | Jun 22 – Jul 22 |
| Cabbage | Transplant outdoors (fall) | Jul 22 – Aug 22 |
| Leaf lettuce | Sow outdoors (spring) | Mar 8 – May 24 |
| Leaf lettuce | Sow outdoors (fall) | Jul 22 – Sep 7 |
| Spinach | Sow outdoors (spring) | Mar 1 – Apr 14 |
| Spinach | Sow outdoors (fall) | Aug 8 – Sep 12 |
| Radishes | Sow outdoors (spring) | Mar 8 – Apr 28 |
| Radishes | Sow outdoors (fall) | Jul 22 – Sep 22 |
| Kale | Sow outdoors (spring) | Mar 25 – Apr 14 |
| Kale | Sow outdoors (fall) | Jul 15 – Aug 22 |
| Carrots | Sow outdoors (spring) | Apr 8 – May 24 |
| Carrots | Sow outdoors (fall) | Jun 22 – Aug 7 |
| Garlic | Plant outdoors (fall) | Oct 22 – Nov 22 |
Where these dates come from
ZIP code 08028 is matched to the NOAA station Glassboro 2 Ne, NJ, 3.7 km away, at 100 ft elevation (48 ft lower than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Glassboro 2 Ne, NJ (used) | 100 ft | Apr 8 | Nov 1 |
| Woodstown Pittsgrov 4E, NJ | 98 ft | Apr 11 | Nov 3 |
| Philadelphia Intl Ap, PA | 10 ft | Apr 2 | Nov 10 |
| Seabrook Farms, NJ | 104 ft | Apr 10 | Nov 1 |
Frost dates near Glassboro
- Pitman, NJ 08071 · last Apr 8, first Nov 1
- Ewan, NJ 08025 · last Apr 8, first Nov 1
- Richwood, NJ 08074 · last Apr 2, first Nov 10
- Sewell, NJ 08080 · last Apr 8, first Nov 1
- Clayton, NJ 08312 · last Apr 10, first Nov 1
- Monroeville, NJ 08343 · last Apr 10, first Nov 1
- Mullica Hill, NJ 08062 · last Apr 2, first Nov 10
- Grenloch, NJ 08032 · last Apr 2, first Nov 10
Frequently asked questions
- When is the last frost in Glassboro, NJ?
- For ZIP code 08028, the average last spring frost (32°F) is April 8, based on NOAA 1991-2020 climate normals for the Glassboro 2 Ne, NJ weather station. There is a 1-in-10 chance of a frost after April 22.
- When is the first frost in Glassboro, NJ?
- The average first fall frost (32°F) is November 1. There is a 1-in-10 chance of frost by October 18, so tender plants are at risk from that point on.
- How long is the growing season in 08028?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 205 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.