USDA Hardiness Zone 7b
Frost Dates for 08046 — Willingboro, New Jersey
NOAA 1991–2020 normals from Philadelphia/Mt Holly WFO, NJ (63 ft), 4 miles east.
Updated
In Willingboro, the last spring frost (32°F) is around April 15 in half of years and has passed by April 29 in nine years out of ten. The first fall frost comes around October 29, as early as October 14 one year in ten, leaving a typical freeze-free season of 196 days (NOAA, Philadelphia/Mt Holly WFO, NJ).
- Last spring frost
- April 15
- First fall frost
- October 29
- Growing season
- 196 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 6
- Last snow
- March 22
- Winters with snow
- 100%
- Snow per year
- 24.8"
median, 1991–2020
median, 1991–2020
27 of 27 observed
NOAA normal
Frost risk by date in Willingboro
Half of springs at Philadelphia/Mt Holly WFO, NJ see their last 32°F night by April 15; only one in ten is past it by April 1, and one in ten still has one after April 29. Planting tender crops after April 20 leaves a 30% risk of a frost on them, after April 24 20%, and after April 29 10%. The 14 days between the even-odds date and the one-in-ten date is narrower than at 66% of the 56 New Jersey stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 29 in half of years, as early as October 14 one year in ten, and holds off past November 10 one year in ten. A hard freeze of 28°F follows 9 days later, around November 7; in spring the one-in-ten date for 28°F is April 15, 14 days before the 32°F one. The freeze-free season lasts 196 days in a typical year, longer than at 55% of the 56 New Jersey stations; it reaches 214 days one year in ten and falls short of 176 one year in ten. On average 111 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 13 days longer, to about April 28, and return around October 17. Severe cold of 16°F or below comes every winter, usually between December 19 and February 27.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 15 | Apr 19 | Apr 22 | Apr 25 | Apr 28 | Apr 30 | May 3 | May 7 | May 13 |
| 32°F | Apr 1 | Apr 6 | Apr 9 | Apr 12 | Apr 15 | Apr 18 | Apr 20 | Apr 24 | Apr 29 |
| 28°F | Mar 18 | Mar 23 | Mar 27 | Mar 31 | Apr 1 | Apr 4 | Apr 6 | Apr 10 | Apr 15 |
| 24°F | Mar 5 | Mar 11 | Mar 14 | Mar 18 | Mar 20 | Mar 23 | Mar 27 | Mar 31 | Apr 3 |
| 20°F | Feb 22 | Feb 28 | Mar 3 | Mar 6 | Mar 9 | Mar 12 | Mar 16 | Mar 19 | Mar 23 |
| 16°F | Feb 7 | Feb 14 | Feb 19 | Feb 23 | Feb 27 | Mar 1 | Mar 5 | Mar 9 | Mar 16 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 4 | Oct 8 | Oct 11 | Oct 14 | Oct 17 | Oct 21 | Oct 24 | Oct 27 | Oct 31 |
| 32°F | Oct 14 | Oct 19 | Oct 23 | Oct 26 | Oct 29 | Nov 1 | Nov 2 | Nov 5 | Nov 10 |
| 28°F | Oct 26 | Oct 31 | Nov 2 | Nov 4 | Nov 7 | Nov 10 | Nov 13 | Nov 15 | Nov 21 |
| 24°F | Nov 4 | Nov 9 | Nov 13 | Nov 15 | Nov 18 | Nov 21 | Nov 25 | Nov 30 | Dec 5 |
| 20°F | Nov 15 | Nov 20 | Nov 25 | Nov 29 | Dec 1 | Dec 5 | Dec 9 | Dec 16 | Dec 23 |
| 16°F | Nov 30 | Dec 5 | Dec 10 | Dec 14 | Dec 19 | Dec 24 | Dec 28 | Jan 1 | Jan 9 |
Freeze probabilities 1991–2020 at Philadelphia/Mt Holly WFO, 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 08046 →Compare Willingboro with another place →
Weather by month in Willingboro
July is the warmest month at Philadelphia/Mt Holly WFO, NJ, averaging 85°F by day and 66°F at night; January is the coldest at 39°F and 23°F. A freezing night is all but certain in every month from November to April (a 90% chance or more). From May to September the chance of a 32°F night stays under 10% each month.
Warmth for growing adds up to 3,390 growing degree days a year (base 50°F), fewer than at 59% of the 56 New Jersey stations. 34% of them (1,145) have built up by the end of June, and July adds the most, 794. Precipitation totals 46.0 inches a year, most in July (5.1") and least in February (2.7"); May to September bring 46% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 39 | 23 | 3.3 | 100% | 26 | 4 |
| Feb | 42 | 23 | 2.7 | 100% | 24 | 3 |
| Mar | 50 | 31 | 4.1 | 100% | 18 | 24 |
| Apr | 63 | 41 | 3.5 | 90% | 4 | 131 |
| May | 72 | 51 | 3.6 | 8% | 0 | 358 |
| Jun | 81 | 61 | 4.2 | 0% | 0 | 624 |
| Jul | 85 | 66 | 5.1 | 0% | 0 | 794 |
| Aug | 83 | 64 | 4.5 | 0% | 0 | 730 |
| Sep | 76 | 57 | 3.7 | 0% | 0 | 496 |
| Oct | 64 | 45 | 3.8 | 59% | 2 | 180 |
| Nov | 54 | 34 | 3.2 | 100% | 14 | 37 |
| Dec | 44 | 28 | 4.3 | 100% | 23 | 9 |
Monthly normals 1991–2020 at Philadelphia/Mt Holly WFO, NJ (63 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, Mt Holly S Jersey Airport, NJ, 6 miles south of Willingboro, has the same 50% last-frost date, a first frost 1 day earlier (October 28), a season 1 day shorter.
When it snows in Willingboro, New Jersey
The first measurable snow (0.1 inch or more) in Willingboro usually arrives around December 6, and the last of the season around March 22. Those are the middle dates across the winters of 1991–2020 at Philadelphia/Mt Holly WFO, NJ, 3.6 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 24 days after the last snow.
Planting calendar for 08046
| When | What to do |
|---|---|
| February 4 – February 18 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 18 – March 4 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 18 – April 1 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 15 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by August 6 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 15 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 29 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 08046 is 4 miles from Philadelphia/Mt Holly WFO, NJ, which stands at 63 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 12 other ZIP codes share the station; its figures are presented in full for 08016 (Burlington). The 2023 USDA Plant Hardiness Zone Map lists ZIP 08046 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.