USDA Hardiness Zone 7b
Frost Dates for 08033 — Haddonfield, New Jersey
NOAA 1991–2020 normals from Pennsauken 1N, NJ (46 ft), 5 miles north.
Updated
In Haddonfield, the last spring frost (32°F) is around April 15 in half of years and has passed by May 1 in nine years out of ten. The first fall frost comes around October 31, as early as October 16 one year in ten, leaving a typical freeze-free season of 199 days (NOAA, Pennsauken 1N, NJ).
- Last spring frost
- April 15
- First fall frost
- October 31
- Growing season
- 199 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
- January 10
- Last snow
- March 9
- Winters with snow
- 96%
- Snow per year
- —
median, 1991–2020
median, 1991–2020
26 of 27 observed
NOAA normal
Frost risk by date in Haddonfield
Half of springs at Pennsauken 1N, 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 May 1. Planting tender crops after April 20 leaves a 30% risk of a frost on them, after April 25 20%, and after May 1 10%. The 16 days between the even-odds date and the one-in-ten date is narrower than at 38% of the 56 New Jersey stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 31 in half of years, as early as October 16 one year in ten, and holds off past November 12 one year in ten. A hard freeze of 28°F follows 10 days later, around November 10; in spring the one-in-ten date for 28°F is April 14, 17 days before the 32°F one. The freeze-free season lasts 199 days in a typical year, longer than at 63% of the 56 New Jersey stations; it reaches 218 days one year in ten and falls short of 177 one year in ten. On average 103 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 27, and return around October 19. Severe cold of 16°F or below comes every winter, usually between December 24 and February 24.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 14 | Apr 19 | Apr 22 | Apr 25 | Apr 27 | May 1 | May 4 | May 9 | May 15 |
| 32°F | Apr 1 | Apr 5 | Apr 8 | Apr 11 | Apr 15 | Apr 17 | Apr 20 | Apr 25 | May 1 |
| 28°F | Mar 17 | Mar 23 | Mar 27 | Mar 30 | Apr 1 | Apr 4 | Apr 6 | Apr 9 | Apr 14 |
| 24°F | Mar 2 | Mar 8 | Mar 12 | Mar 15 | Mar 19 | Mar 22 | Mar 25 | Mar 30 | Apr 2 |
| 20°F | Feb 17 | Feb 24 | Feb 28 | Mar 3 | Mar 6 | Mar 10 | Mar 13 | Mar 17 | Mar 22 |
| 16°F | Feb 1 | Feb 8 | Feb 13 | Feb 19 | Feb 24 | Feb 28 | Mar 2 | Mar 6 | Mar 12 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 6 | Oct 10 | Oct 14 | Oct 17 | Oct 19 | Oct 22 | Oct 26 | Oct 29 | Nov 1 |
| 32°F | Oct 16 | Oct 21 | Oct 25 | Oct 28 | Oct 31 | Nov 2 | Nov 5 | Nov 8 | Nov 12 |
| 28°F | Oct 31 | Nov 2 | Nov 5 | Nov 8 | Nov 10 | Nov 13 | Nov 16 | Nov 20 | Nov 24 |
| 24°F | Nov 7 | Nov 11 | Nov 15 | Nov 18 | Nov 21 | Nov 25 | Nov 29 | Dec 3 | Dec 9 |
| 20°F | Nov 16 | Nov 22 | Nov 27 | Dec 1 | Dec 5 | Dec 10 | Dec 15 | Dec 21 | Dec 31 |
| 16°F | Dec 1 | Dec 7 | Dec 13 | Dec 20 | Dec 24 | Dec 29 | Jan 2 | Jan 9 | Jan 17 |
Freeze probabilities 1991–2020 at Pennsauken 1N, 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 08033 →Compare Haddonfield with another place →
Weather by month in Haddonfield
July is the warmest month at Pennsauken 1N, NJ, averaging 87°F by day and 68°F at night; January is the coldest at 40°F and 25°F. A freezing night is all but certain in every month from November to March (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, April still brings one in 89% of years and May still brings one in 10% of years.
Warmth for growing adds up to 3,711 growing degree days a year (base 50°F), more than at 73% of the 56 New Jersey stations. 34% of them (1,249) have built up by the end of June, and July adds the most, 849. Precipitation totals 48.2 inches a year, most in July (5.0") and least in February (2.6"); May to September bring 45% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 40 | 25 | 3.5 | 100% | 25 | 5 |
| Feb | 43 | 26 | 2.6 | 100% | 23 | 5 |
| Mar | 52 | 33 | 4.4 | 100% | 17 | 32 |
| Apr | 64 | 43 | 3.9 | 89% | 4 | 152 |
| May | 73 | 52 | 3.9 | 10% | <1 | 393 |
| Jun | 82 | 62 | 4.6 | 0% | 0 | 661 |
| Jul | 87 | 68 | 5.0 | 0% | 0 | 849 |
| Aug | 85 | 66 | 4.1 | 0% | 0 | 783 |
| Sep | 78 | 59 | 4.3 | 0% | 0 | 551 |
| Oct | 66 | 47 | 4.1 | 51% | 1 | 218 |
| Nov | 55 | 37 | 3.3 | 99% | 12 | 49 |
| Dec | 45 | 30 | 4.5 | 100% | 22 | 12 |
Monthly normals 1991–2020 at Pennsauken 1N, NJ (46 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, Moorestown, NJ, 5 miles northeast of Haddonfield, has a last frost 3 days earlier (April 12), a first frost 1 day later (November 1), a season 1 day longer.
When it snows in Haddonfield, New Jersey
The first measurable snow (0.1 inch or more) in Haddonfield usually arrives around January 10, and the last of the season around March 9. Those are the middle dates across the winters of 1991–2020 at Pennsauken 1N, NJ, 5 miles away: half of years saw snow earlier, half later. Snow fell in 96% of those winters. The last 32°F night of spring typically comes 37 days after the last snow.
Planting calendar for 08033
| 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 8 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 17 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 31 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 08033 is 5 miles from Pennsauken 1N, NJ, which stands at 46 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 14 other ZIP codes share the station; its figures are presented in full for 19124 (Philadelphia). The 2023 USDA Plant Hardiness Zone Map lists ZIP 08033 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.