USDA Hardiness Zone 7b
Frost Dates for 07109 — Belleville, New Jersey
NOAA 1991–2020 normals from Harrison, NJ (24 ft), 3 miles south.
Updated
In Belleville, the last spring frost (32°F) is around April 4 in half of years and has passed by April 16 in nine years out of ten. The first fall frost comes around November 6, as early as October 25 one year in ten, leaving a typical freeze-free season of 216 days (NOAA, Harrison, NJ).
- Last spring frost
- April 4
- First fall frost
- November 6
- Growing season
- 216 days
- Hardiness zone
- 7b
50% probability
50% probability
freeze-free, 50%
5 to 10°F (-15.0 to -12.2°C) coldest night
- First snow
- December 10
- Last snow
- March 18
- Winters with snow
- 100%
- Snow per year
- 28.2"
median, 1991–2020
median, 1991–2020
24 of 24 observed
NOAA normal
Frost risk by date in Belleville
Half of springs at Harrison, NJ see their last 32°F night by April 4; only one in ten is past it by March 23, and one in ten still has one after April 16. Planting tender crops after April 8 leaves a 30% risk of a frost on them, after April 11 20%, and after April 16 10%. The 12 days between the even-odds date and the one-in-ten date is narrower than at 91% of the 56 New Jersey stations behind this site's ZIP pages.
In fall the first 32°F night comes by November 6 in half of years, as early as October 25 one year in ten, and holds off past November 22 one year in ten. A hard freeze of 28°F follows 13 days later, around November 19; in spring the one-in-ten date for 28°F is April 5, 11 days before the 32°F one. The freeze-free season lasts 216 days in a typical year, longer than at 82% of the 56 New Jersey stations; it reaches 237 days one year in ten and falls short of 197 one year in ten. On average 83 nights a year drop to 32°F or below. Nights of 36°F, when frost can still settle on leaves in low, open spots, continue 12 days longer, to about April 16, and return around October 27. Severe cold of 16°F or below comes every winter, usually between December 30 and February 25.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 4 | Apr 8 | Apr 11 | Apr 14 | Apr 16 | Apr 20 | Apr 23 | Apr 27 | May 2 |
| 32°F | Mar 23 | Mar 29 | Apr 1 | Apr 2 | Apr 4 | Apr 6 | Apr 8 | Apr 11 | Apr 16 |
| 28°F | Mar 11 | Mar 16 | Mar 20 | Mar 24 | Mar 26 | Mar 29 | Mar 31 | Apr 2 | Apr 5 |
| 24°F | Feb 28 | Mar 5 | Mar 9 | Mar 13 | Mar 16 | Mar 19 | Mar 22 | Mar 25 | Mar 29 |
| 20°F | Feb 18 | Feb 25 | Mar 1 | Mar 4 | Mar 7 | Mar 10 | Mar 14 | Mar 18 | Mar 23 |
| 16°F | Feb 2 | Feb 7 | Feb 14 | Feb 20 | Feb 25 | Feb 28 | Mar 3 | Mar 7 | Mar 13 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 12 | Oct 17 | Oct 21 | Oct 24 | Oct 27 | Oct 30 | Nov 1 | Nov 4 | Nov 9 |
| 32°F | Oct 25 | Oct 30 | Nov 1 | Nov 4 | Nov 6 | Nov 10 | Nov 13 | Nov 18 | Nov 22 |
| 28°F | Nov 5 | Nov 9 | Nov 12 | Nov 15 | Nov 19 | Nov 22 | Nov 26 | Dec 1 | Dec 5 |
| 24°F | Nov 15 | Nov 19 | Nov 24 | Nov 28 | Dec 1 | Dec 5 | Dec 9 | Dec 14 | Dec 21 |
| 20°F | Nov 27 | Dec 2 | Dec 7 | Dec 12 | Dec 16 | Dec 20 | Dec 24 | Dec 29 | Jan 4 |
| 16°F | Dec 9 | Dec 16 | Dec 22 | Dec 26 | Dec 30 | Jan 2 | Jan 6 | Jan 12 | Jan 22 |
Freeze probabilities 1991–2020 at Harrison, NJ, from NOAA NCEI U.S. Climate Normals. Where a temperature is reached in fewer than 99.5% of years, the dates describe only the years that reach it. Not a forecast.
Frost risk on any date in 07109 →Compare Belleville with another place →
Weather by month in Belleville
July is the warmest month at Harrison, NJ, averaging 87°F by day and 69°F at night; January is the coldest at 39°F and 25°F. A freezing night is all but certain in every month from November to March (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 70% of years.
Warmth for growing adds up to 3,759 growing degree days a year (base 50°F), more than at 77% of the 56 New Jersey stations. 33% of them (1,242) have built up by the end of June, and July adds the most, 863. Precipitation totals 50.7 inches a year, most in June (4.9") and least in February (3.3"); May to September bring 45% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 39 | 25 | 3.7 | 100% | 23 | 3 |
| Feb | 42 | 26 | 3.3 | 100% | 21 | 4 |
| Mar | 50 | 33 | 4.3 | 100% | 14 | 25 |
| Apr | 62 | 43 | 4.1 | 70% | 2 | 140 |
| May | 72 | 54 | 4.4 | 1% | 0 | 399 |
| Jun | 82 | 63 | 4.9 | 0% | 0 | 672 |
| Jul | 87 | 69 | 4.8 | 0% | 0 | 863 |
| Aug | 85 | 67 | 4.4 | 0% | 0 | 800 |
| Sep | 78 | 60 | 4.3 | 0% | 0 | 564 |
| Oct | 66 | 48 | 4.2 | 24% | <1 | 231 |
| Nov | 54 | 38 | 3.7 | 96% | 5 | 49 |
| Dec | 44 | 31 | 4.6 | 100% | 18 | 9 |
Monthly normals 1991–2020 at Harrison, NJ (24 ft), NOAA NCEI. "32°F night": chance of at least one in the month. GDD: growing degree days, base 50°F.
Compared with the next station
The nearest other station, Teterboro Airport, NJ, 7 miles northeast of Belleville, has a last frost 1 day earlier (April 3), a first frost 2 days earlier (November 4), a season 1 day shorter.
When it snows in Belleville, New Jersey
The first measurable snow (0.1 inch or more) in Belleville usually arrives around December 10, and the last of the season around March 18. Those are the middle dates across the winters of 1991–2020 at Harrison, NJ, 3.2 miles away: half of years saw snow earlier, half later. Every one of those winters saw snow. The last 32°F night of spring typically comes 17 days after the last snow.
Planting calendar for 07109
| When | What to do |
|---|---|
| January 24 – February 7 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 7 – February 21 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 7 – March 21 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 4 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by August 14 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 23 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| November 6 onward | Plant garlic, mulch beds, lift tender bulbsGarlic wants a cold spell; bare soil loses structure over winter. |
The weeks before and after the 50% dates are general rules of thumb, not NOAA figures; a seed packet gives the timing for each variety.
Where these figures come from
ZIP 07109 is 3 miles from Harrison, NJ, which stands at 24 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 17 other ZIP codes share the station; its figures are presented in full for 07105 (Newark). The 2023 USDA Plant Hardiness Zone Map lists ZIP 07109 in zone 7b, the band where the coldest night of the year averaged 5 to 10°F (-15.0 to -12.2°C) over 1991–2020; a zone describes winter lows, not frost dates.
Frost dates across New Jersey →
Hardiness zone and temperature range: USDA Plant Hardiness Zone Map 2023 (USDA-ARS, Oregon State University), ZIP-code listing, unchanged. °C converted from °F by this site.
Thirty-year averages, not a forecast: check the forecast before planting out. How stations are matched and which pages are offered to search engines: methodology.