Frost dates for 08833Lebanon, NJ
The average last spring frost in Lebanon is April 24 and the average first fall frost is October 21, giving a typical growing season of about 179 days. Dates are based on NOAA 1991-2020 climate normals.
- Average last spring frost
- Apr 24
- Average first fall frost
- Oct 21
- Growing season
- 179 days
Safer after May 11 (1-in-10 risk)
Possible by Oct 6 (1-in-10 risk)
Last frost typically in 172 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 21 · May 6 · May 22 | Sep 29 · Oct 9 · Oct 24 | 156 days | 100% |
| Frost / freeze (32°F) | Apr 9 · Apr 24 · May 11 | Oct 6 · Oct 21 · Nov 5 | 179 days | 100% |
| Hard freeze (28°F) | Mar 27 · Apr 8 · Apr 25 | Oct 16 · Nov 2 · Nov 16 | 206 days | 100% |
Planting calendar for Lebanon
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 24 – May 30 |
| Tomatoes | Transplant outdoors | May 10 – Jul 1 |
| Peppers | Start seeds indoors | Mar 24 – Apr 24 |
| Peppers | Transplant outdoors | May 24 – Jun 24 |
| Eggplant | Start seeds indoors | Apr 10 – May 9 |
| Eggplant | Transplant outdoors | May 24 – Jun 24 |
| Cucumbers | Sow outdoors | May 24 – Jul 11 |
| Summer squash | Sow outdoors | May 10 – Jun 24 |
| Winter squash & pumpkins | Sow outdoors | May 24 – Jun 24 |
| Snap beans | Sow outdoors | May 10 – Aug 3 |
| Sweet corn | Sow outdoors | May 10 – Jul 1 |
| Watermelon & cantaloupe | Sow outdoors | May 24 – Jun 24 |
| Okra | Sow outdoors | May 17 – Jun 9 |
| Peas | Sow outdoors (spring) | Mar 24 – May 9 |
| Potatoes | Plant outdoors (spring) | Mar 24 – May 24 |
| Onions | Start seeds indoors (spring) | Feb 10 – Mar 9 |
| Onions | Transplant outdoors (spring) | Apr 10 – May 9 |
| Broccoli | Start seeds indoors (spring) | Mar 6 – Apr 9 |
| Broccoli | Transplant outdoors (spring) | Apr 10 – May 9 |
| Broccoli | Start seeds indoors (fall) | Jun 21 – Jul 1 |
| Broccoli | Transplant outdoors (fall) | Jul 21 – Aug 1 |
| Cabbage | Start seeds indoors (spring) | Feb 24 – Mar 24 |
| Cabbage | Transplant outdoors (spring) | Mar 24 – Apr 24 |
| Cabbage | Start seeds indoors (fall) | Jun 11 – Jul 11 |
| Cabbage | Transplant outdoors (fall) | Jul 11 – Aug 11 |
| Leaf lettuce | Sow outdoors (spring) | Mar 24 – Jun 9 |
| Leaf lettuce | Sow outdoors (fall) | Jul 11 – Aug 27 |
| Spinach | Sow outdoors (spring) | Mar 17 – Apr 30 |
| Spinach | Sow outdoors (fall) | Jul 28 – Sep 1 |
| Radishes | Sow outdoors (spring) | Mar 24 – May 14 |
| Radishes | Sow outdoors (fall) | Jul 11 – Sep 11 |
| Kale | Sow outdoors (spring) | Apr 10 – Apr 30 |
| Kale | Sow outdoors (fall) | Jul 4 – Aug 11 |
| Carrots | Sow outdoors (spring) | Apr 24 – Jun 9 |
| Carrots | Sow outdoors (fall) | Jun 11 – Jul 27 |
| Garlic | Plant outdoors (fall) | Oct 11 – Nov 11 |
Where these dates come from
ZIP code 08833 is matched to the NOAA station Flemington 5 Nnw, NJ, 9.2 km away, at 265 ft elevation (16 ft higher than the ZIP code's center). Nearby stations for comparison:
| Station | Elevation | Avg last frost | Avg first frost |
|---|---|---|---|
| Flemington 5 Nnw, NJ (used) | 265 ft | Apr 24 | Oct 21 |
| Somerville Somerset Ap, NJ | 105 ft | Apr 26 | Oct 18 |
| Somerville 4 Nw, NJ | 134 ft | Apr 30 | Oct 20 |
| Wertsville 4 Ne, NJ | 283 ft | Apr 16 | Oct 27 |
Frost dates near Lebanon
- Annandale, NJ 08801 · last Apr 24, first Oct 21
- Whitehouse Station, NJ 08889 · last Apr 26, first Oct 18
- High Bridge, NJ 08829 · last Apr 24, first Oct 21
- Clinton, NJ 08809 · last Apr 24, first Oct 21
- Oldwick, NJ 08858 · last Apr 26, first Oct 18
- Stanton, NJ 08885 · last Apr 24, first Oct 21
- Califon, NJ 07830 · last Apr 24, first Oct 21
- Whitehouse, NJ 08888 · last Apr 26, first Oct 18
Frequently asked questions
- When is the last frost in Lebanon, NJ?
- For ZIP code 08833, the average last spring frost (32°F) is April 24, based on NOAA 1991-2020 climate normals for the Flemington 5 Nnw, NJ weather station. There is a 1-in-10 chance of a frost after May 11.
- When is the first frost in Lebanon, NJ?
- The average first fall frost (32°F) is October 21. There is a 1-in-10 chance of frost by October 6, so tender plants are at risk from that point on.
- How long is the growing season in 08833?
- In half of years, the frost-free season (between the last and first 32°F frost) is at least 179 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.