Skip to content
Frost Date Finder

USDA Hardiness Zone 7b

Frost Dates for 08223 — Marmora, New Jersey

NOAA 1991–2020 normals from Margate, NJ (16 ft), 9 miles northeast.

Updated

In Marmora, the last spring frost (32°F) is around March 26 in half of years and has passed by April 7 in nine years out of ten. The first fall frost comes around November 22, as early as November 7 one year in ten, leaving a typical freeze-free season of 243 days (NOAA, Margate, NJ).

Last spring frost
March 26

50% probability

First fall frost
November 22

50% probability

Growing season
243 days

freeze-free, 50%

Hardiness zone
7b

5 to 10°F (-15.0 to -12.2°C) coldest night

First snow
January 7

median, 1991–2020

Last snow
February 27

median, 1991–2020

Winters with snow
95%

20 of 21 observed

Snow per year
—

NOAA normal

ShareXFacebookWhatsAppEmail

Frost risk by date in Marmora

Half of springs at Margate, NJ see their last 32°F night by March 26; only one in ten is past it by March 9, and one in ten still has one after April 7. Planting tender crops after March 31 leaves a 30% risk of a frost on them, after April 3 20%, and after April 7 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 22 in half of years, as early as November 7 one year in ten, and holds off past December 10 one year in ten. A hard freeze of 28°F follows 13 days later, around December 5; in spring the one-in-ten date for 28°F is March 28, 10 days before the 32°F one. The freeze-free season lasts 243 days in a typical year, the longest of the 56 New Jersey stations; it reaches 265 days one year in ten and falls short of 221 one year in ten. On average 42 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 7, and return around November 8. Nights of 24°F, cold enough to damage hardier plants, come in 100% of winters and 16°F in 79%.

Spring: the chance of another night this cold after the date
Low90%80%70%60%50%40%30%20%10%
36°FMar 24Mar 30Apr 2Apr 4Apr 7Apr 10Apr 14Apr 17Apr 22
32°FMar 9Mar 15Mar 19Mar 23Mar 26Mar 29Mar 31Apr 3Apr 7
28°FFeb 27Mar 2Mar 7Mar 10Mar 13Mar 16Mar 19Mar 24Mar 28
24°FFeb 10Feb 18Feb 25Feb 28Mar 3Mar 6Mar 9Mar 13Mar 19
20°F98% of yrsJan 26Feb 1Feb 6Feb 11Feb 17Feb 22Feb 27Mar 2Mar 8
16°F79% of yrsJan 11Jan 21Jan 28Jan 31Feb 3Feb 8Feb 13Feb 20Feb 27
Fall: the chance the first night this cold has come by the date
Low10%20%30%40%50%60%70%80%90%
36°FOct 29Nov 1Nov 3Nov 6Nov 8Nov 12Nov 15Nov 19Nov 25
32°FNov 7Nov 12Nov 15Nov 18Nov 22Nov 25Nov 29Dec 3Dec 10
28°FNov 18Nov 24Nov 28Dec 1Dec 5Dec 9Dec 14Dec 19Dec 25
24°FDec 1Dec 7Dec 12Dec 18Dec 22Dec 26Dec 31Jan 5Jan 12
20°F98% of yrsDec 13Dec 23Dec 29Jan 1Jan 5Jan 9Jan 14Jan 21Feb 1
16°F79% of yrsDec 28Jan 2Jan 6Jan 11Jan 16Jan 20Jan 26Jan 31Feb 9

Freeze probabilities 1991–2020 at Margate, 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 08223 →Compare Marmora with another place →

Compared with the next station

The nearest other station, Belleplain Stn Forest, NJ, 10 miles west of Marmora, has a last frost 29 days later (April 24), a first frost 31 days earlier (October 22), a season 62 days shorter.

Frost dates for 08270 (Woodbine) →

When it snows in Marmora, New Jersey

The first measurable snow (0.1 inch or more) in Marmora usually arrives around January 7, and the last of the season around February 27. Those are the middle dates across the winters of 1991–2020 at Margate, NJ, 9.3 miles away: half of years saw snow earlier, half later. Snow fell in 95% of those winters. The last 32°F night of spring typically comes 27 days after the last snow.

Planting calendar for 08223

What to do and when, from the 50% frost dates for Marmora, New Jersey
WhenWhat to do
January 15 – January 29Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out.
January 29 – February 12Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early.
February 26 – March 12Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil.
March 26 onwardTransplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast.
by August 30Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops.
by November 8Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation.
November 22 onwardPlant 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 08223 is 9 miles from Margate, NJ, which stands at 16 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 7 other ZIP codes share the station; its figures are presented in full for 08232 (Pleasantville). The 2023 USDA Plant Hardiness Zone Map lists ZIP 08223 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.

ZIP codes measured at the same station

Other zone 7b places in New Jersey