Phillipsburg, NJ planting zone & frost dates
Phillipsburg is in USDA hardiness zone 7a. The last spring frost usually comes around April 18 and the first fall frost around October 25, for a growing season of about 188 days.
Planting calendar for Phillipsburg
Dates are counted from the average last spring frost (April 18) using the typical timing recommended by U.S. extension services. Warm-season crops go out only after the danger of frost has passed and the soil has warmed.
| Crop | When |
|---|---|
| Tomatoes | Start seeds indoors: Feb 21 – Mar 7 Transplant outdoors: Apr 25 – May 2 |
| Peppers | Start seeds indoors: Feb 7 – Feb 21 Transplant outdoors: May 2 – May 9 |
| Eggplant | Start seeds indoors: Feb 7 – Feb 21 Transplant outdoors: May 2 – May 9 |
| Broccoli | Start seeds indoors: Feb 7 – Feb 21 Transplant outdoors: Mar 21 – Apr 4 |
| Cabbage | Start seeds indoors: Feb 7 – Feb 21 Transplant outdoors: Mar 21 – Apr 4 |
| Onions (sets) | Plant outdoors: Mar 21 – Apr 4 |
| Peas | Sow outdoors: Mar 7 – Mar 21 |
| Spinach | Sow outdoors: Mar 7 – Mar 21 |
| Lettuce | Sow outdoors: Mar 21 – Apr 4 |
| Carrots | Sow outdoors: Mar 21 – Apr 4 |
| Potatoes | Plant outdoors: Mar 21 – Apr 4 |
| Beans | Sow outdoors: Apr 25 – May 2 |
| Sweet corn | Sow outdoors: Apr 25 – May 2 |
| Cucumbers | Sow outdoors: Apr 25 – May 2 |
| Squash & zucchini | Sow outdoors: Apr 25 – May 2 |
| Basil | Start seeds indoors: Mar 7 – Mar 21 Transplant outdoors: Apr 25 – May 2 |
Fall garden: cool-season crops like lettuce, spinach and kale can be sown again around Aug 30 (8 weeks before the average first fall frost on Oct 25).
Useful for zone 7a gardens
- Seed starting kit with dome — to start seeds indoors before the last frost
- LED grow light for seedlings — stops leggy seedlings
- Frost cloth / plant covers — for late spring and early fall frosts
- Soil thermometer — warm-season crops need soil above 60°F
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Frost risk in detail
| 90% chance | 50% chance | 10% chance | |
|---|---|---|---|
| Last 32°F frost in spring is after | Apr 5 | Apr 18 | May 5 |
| First 32°F frost in fall is before | Nov 5 | Oct 25 | Oct 11 |
How to read it: in spring there is a 10% chance of a frost after May 5, so that is a safe date for tender plants. In fall there is a 10% chance of frost before October 11. A hard freeze (28°F) usually ends around April 4.
Hardiness zone by ZIP code in Phillipsburg
- 08865 zone 7a
Nearby cities
- Hillsborough zone 7a, last frost Apr 16
- Bridgewater zone 7a, last frost Apr 30
- Bradley Gardens zone 7a, last frost Apr 30
- Ewing zone 7b, last frost Apr 17
- Hopatcong Hills zone 6b, last frost Apr 25
- Hopatcong zone 6b, last frost Apr 25
- Somerville zone 7a, last frost Apr 30
- Manville zone 7a, last frost Apr 30
Questions
What growing zone is Phillipsburg, NJ?
Phillipsburg is in USDA Plant Hardiness Zone 7a (average extreme winter low 0°F to 5°F), according to the USDA 2023 map.
When is the last frost in Phillipsburg?
The average last spring frost (32°F) in Phillipsburg is April 18. There is still a 10% chance of frost until May 5.
When can I plant tomatoes in Phillipsburg?
Transplant tomatoes outdoors 1–2 weeks after the average last frost: around Apr 25 – May 2. Start seeds indoors 6–8 weeks before the last frost.
Frost dates: NOAA U.S. Climate Normals 1991–2020, station Phillipsburg-Easton Brg, NJ (USC00286979), 0.9 km (0.6 mi) from the city center, elevation 71 m, based on 10 years of records. Hardiness zone: USDA Plant Hardiness Zone Map 2023 for the ZIP code nearest to the city center. Microclimates (valleys, hills, cities, coasts) can be warmer or colder: check the local forecast before planting. How we calculate the data.