New Jersey Frost Dates & Growing Season Guide
New Jersey (NJ) spans USDA hardiness zones 7a, 7b, with growing seasons ranging from 198 days in Trenton to 217 days in Atlantic City. The average growing season across the state is approximately 206 days.
New Jersey City Frost Dates
The table below shows the average last spring frost date, first fall frost date, growing season length, and USDA hardiness zone for each city. Click a city name for detailed planting calendars and zone information.
| City | Last Spring Frost | First Fall Frost | Growing Season | Zone | Min Temp |
|---|---|---|---|---|---|
| Newark | April 8 | October 28 | 203 days | 7a | 0°F |
| Trenton | April 10 | October 25 | 198 days | 7a | 0°F |
| Atlantic City | April 2 | November 5 | 217 days | 7b | 5°F |
| Cherry Hill | April 7 | October 30 | 206 days | 7a | 0°F |
Planting Windows for New Jersey
Based on average frost dates, here are the recommended planting windows for each city. The indoor seed start date is approximately seven weeks before the last spring frost. Transplanting should occur about two weeks after the last frost. The last direct sow date for fall crops is ten weeks before the first fall frost.
| City | Start Seeds Indoors | Transplant After | Last Direct Sow |
|---|---|---|---|
| Newark | February 19 | April 22 | August 19 |
| Trenton | February 21 | April 24 | August 16 |
| Atlantic City | February 13 | April 16 | August 27 |
| Cherry Hill | February 18 | April 21 | August 21 |
Gardening in New Jersey
New Jersey's compact geography holds surprising garden diversity, from the Sandy Hook coastline to the Delaware Water Gap. The Garden State nickname is well-earned: zone 7a temperatures and 198 to 217 frost-free days support a wide vegetable palette. Coastal areas benefit from oceanic temperature moderation, while the Pine Barrens have acidic, sandy soils ideal for blueberries (New Jersey is a top producer). Northern New Jersey has heavier clay soils and slightly shorter seasons. Tomatoes are the state's signature garden crop, and the BLT-worthy Jersey tomato is a point of pride. Start warm-season transplants indoors in mid-March for setting out in early May. Fall gardens planted in August extend the season with cool-weather crops.
Understanding New Jersey's Hardiness Zones
New Jersey includes USDA hardiness zones 7a, 7b. These zones indicate the average annual extreme minimum winter temperature for each area, which determines which perennial plants, trees, and shrubs can survive winter without protection. When purchasing trees, shrubs, or perennial flowers, always check that the plant is rated for your hardiness zone or a lower (colder) zone number.
Tips for Using New Jersey Frost Dates
These frost dates represent long-term averages and should be treated as guidelines rather than guarantees. In any given year, the actual last spring frost or first fall frost may arrive one to three weeks earlier or later than the average. Factors that affect your specific location include elevation above the city center, proximity to water, slope direction, and whether you are in an urban or rural area. South-facing slopes and areas near large pavement or building masses tend to be warmer than surrounding open land. Low-lying valleys and exposed hilltops are often colder than mid-slope positions.
To protect against late spring frosts, keep row cover fabric, old bed sheets, or frost blankets on hand. Monitor your local weather forecast daily as the average frost date approaches. When frost is predicted after you have transplanted, covering plants in the late afternoon traps ground heat and can protect against temperatures down to about 28 degrees Fahrenheit. For fall season extension, the same covers protect mature plants from early frosts, often buying several additional weeks of harvest.