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New Jersey frost dates
Across the 10New Jersey weather stations below, the average last spring frost ranges from Mar 26 in Atlantic to May 1 in Sussex. The statewide middle is about Apr 14 for the last spring frost and Oct 28 for the first fall frost. Atlantic has the longest growing season, about 240 days. Hardiness zones in these places: 6b, 7a, 7b, 8a.
Frost dates by city
| Place | Zone | Last spring frost | 90% safe after | First fall frost | Frost-free days |
|---|---|---|---|---|---|
| Atlantic | 8a | Mar 26 | Apr 6 | Nov 21 | 240 |
| Newark | 7b | Apr 2 | Apr 15 | Nov 10 | 222 |
| Teterboro | 7b | Apr 3 | Apr 16 | Nov 4 | 215 |
| Trenton Mercer | 7b | Apr 10 | Apr 25 | Nov 1 | 205 |
| Caldwell Essex | 7a | Apr 14 | Apr 30 | Oct 28 | 197 |
| Mt Holly S Jersey | 7b | Apr 15 | May 2 | Oct 28 | 196 |
| Millville | 7a | Apr 24 | May 10 | Oct 23 | 182 |
| Andover Aeroflex | 6b | Apr 25 | May 11 | Oct 19 | 177 |
| Somerville Somerset | 7a | Apr 26 | May 13 | Oct 18 | 175 |
| Sussex | 6b | May 1 | May 18 | Oct 12 | 164 |
Dates are the 50% probability of a 32°F freeze (NOAA 1991–2020 normals); "90% safe after" is the date after which a later spring freeze happens in only 1 year in 10.
When to plant in New Jersey
Using the statewide middle dates (last frost Apr 14, first frost Oct 28). Adjust for your town with the table above or the planting calendar.
| Plant | When to plant in New Jersey |
|---|---|
| Tomatoes | Apr 21 – May 5 |
| Peas | Mar 3 – Mar 24; fall: Aug 5 – Aug 26 |
| Potatoes | Mar 17 – Apr 7 |
| Green beans | Apr 21 – May 5; fall: Aug 12 – Aug 26 |
| Garlic | Oct 28 – Nov 25 |
| Tulips | Oct 14 – Nov 25 |