USDA Hardiness Zone 7a
Frost Dates for 08009 — Berlin, New Jersey
NOAA 1991–2020 normals from Indian Mills 2 W, NJ (100 ft), 8 miles east.
Updated
In Berlin, the last spring frost (32°F) is around April 28 in half of years and has passed by May 16 in nine years out of ten. The first fall frost comes around October 15, as early as October 3 one year in ten, leaving a typical freeze-free season of 169 days (NOAA, Indian Mills 2 W, NJ).
- Last spring frost
- April 28
- First fall frost
- October 15
- Growing season
- 169 days
- Hardiness zone
- 7a
50% probability
50% probability
freeze-free, 50%
0 to 5°F (-17.8 to -15.0°C) coldest night
- First snow
- December 26
- Last snow
- March 2
- Winters with snow
- 97%
- Snow per year
- 23.5"
median, 1991–2020
median, 1991–2020
29 of 30 observed
NOAA normal
Frost risk by date in Berlin
Half of springs at Indian Mills 2 W, NJ see their last 32°F night by April 28; only one in ten is past it by April 14, and one in ten still has one after May 16. Planting tender crops after May 4 leaves a 30% risk of a frost on them, after May 9 20%, and after May 16 10%. The 18 days between the even-odds date and the one-in-ten date is wider than at 80% of the 56 New Jersey stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 15 in half of years, as early as October 3 one year in ten, and holds off past October 30 one year in ten. A hard freeze of 28°F follows 12 days later, around October 27; in spring the one-in-ten date for 28°F is April 30, 16 days before the 32°F one. The freeze-free season lasts 169 days in a typical year, shorter than at 95% of the 56 New Jersey stations; it reaches 191 days one year in ten and falls short of 149 one year in ten. On average 112 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 May 10, and return around October 5. Severe cold of 16°F or below comes every winter, usually between December 5 and March 6.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 25 | Apr 30 | May 2 | May 7 | May 10 | May 13 | May 17 | May 21 | May 26 |
| 32°F | Apr 14 | Apr 19 | Apr 22 | Apr 25 | Apr 28 | May 1 | May 4 | May 9 | May 16 |
| 28°F | Mar 29 | Apr 3 | Apr 7 | Apr 11 | Apr 15 | Apr 19 | Apr 22 | Apr 25 | Apr 30 |
| 24°F | Mar 15 | Mar 21 | Mar 25 | Mar 29 | Mar 31 | Apr 3 | Apr 5 | Apr 9 | Apr 15 |
| 20°F | Feb 28 | Mar 6 | Mar 12 | Mar 15 | Mar 19 | Mar 22 | Mar 26 | Mar 30 | Apr 2 |
| 16°F | Feb 16 | Feb 23 | Feb 27 | Mar 2 | Mar 6 | Mar 9 | Mar 14 | Mar 18 | Mar 23 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Sep 24 | Sep 28 | Oct 1 | Oct 3 | Oct 5 | Oct 7 | Oct 11 | Oct 14 | Oct 18 |
| 32°F | Oct 3 | Oct 6 | Oct 9 | Oct 13 | Oct 15 | Oct 18 | Oct 21 | Oct 25 | Oct 30 |
| 28°F | Oct 10 | Oct 16 | Oct 20 | Oct 23 | Oct 27 | Oct 29 | Nov 1 | Nov 4 | Nov 8 |
| 24°F | Oct 23 | Oct 29 | Nov 1 | Nov 3 | Nov 6 | Nov 9 | Nov 13 | Nov 17 | Nov 23 |
| 20°F | Nov 4 | Nov 9 | Nov 13 | Nov 17 | Nov 21 | Nov 25 | Nov 30 | Dec 4 | Dec 12 |
| 16°F | Nov 14 | Nov 21 | Nov 27 | Dec 2 | Dec 5 | Dec 10 | Dec 17 | Dec 24 | Dec 31 |
Freeze probabilities 1991–2020 at Indian Mills 2 W, 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 08009 →Compare Berlin with another place →
Weather by month in Berlin
July is the warmest month at Indian Mills 2 W, NJ, averaging 87°F by day and 64°F at night; January is the coldest at 42°F and 24°F. A freezing night is all but certain in every month from October to April (a 90% chance or more). From June to September the chance of a 32°F night stays under 10% each month. In spring, May still brings one in 40% of years.
Warmth for growing adds up to 3,501 growing degree days a year (base 50°F), more than at 52% of the 56 New Jersey stations. 34% of them (1,191) have built up by the end of June, and July adds the most, 792. Precipitation totals 50.5 inches a year, most in August (5.3") and least in February (3.0"); May to September bring 46% of it.
| Month | High °F | Low °F | Precip. in | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|---|
| Jan | 42 | 24 | 3.7 | 100% | 25 | 7 |
| Feb | 45 | 24 | 3.0 | 100% | 22 | 7 |
| Mar | 53 | 31 | 4.5 | 100% | 18 | 34 |
| Apr | 65 | 40 | 3.7 | 99% | 7 | 151 |
| May | 74 | 50 | 3.8 | 40% | 1 | 379 |
| Jun | 82 | 59 | 4.4 | 0% | 0 | 614 |
| Jul | 87 | 64 | 5.2 | 0% | 0 | 792 |
| Aug | 85 | 62 | 5.3 | 0% | 0 | 732 |
| Sep | 78 | 55 | 4.4 | 5% | 0 | 506 |
| Oct | 67 | 44 | 4.4 | 92% | 4 | 212 |
| Nov | 56 | 34 | 3.5 | 100% | 14 | 55 |
| Dec | 47 | 28 | 4.6 | 100% | 22 | 13 |
Monthly normals 1991–2020 at Indian Mills 2 W, NJ (100 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, Glassboro 2 NE, NJ, 9 miles west of Berlin, has a last frost 20 days earlier (April 8), a first frost 17 days later (November 1), a season 36 days longer.
When it snows in Berlin, New Jersey
The first measurable snow (0.1 inch or more) in Berlin usually arrives around December 26, and the last of the season around March 2. Those are the middle dates across the winters of 1991–2020 at Indian Mills 2 W, NJ, 8.4 miles away: half of years saw snow earlier, half later. Snow fell in 97% of those winters. The last 32°F night of spring typically comes 57 days after the last snow.
Planting calendar for 08009
| When | What to do |
|---|---|
| February 17 – March 3 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| March 3 – March 17 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 31 – April 14 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 28 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by July 23 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 1 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 15 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 08009 is 8 miles from Indian Mills 2 W, NJ, which stands at 100 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 4 other ZIP codes share the station; its figures are presented in full for 08055 (Medford). The 2023 USDA Plant Hardiness Zone Map lists ZIP 08009 in zone 7a, the band where the coldest night of the year averaged 0 to 5°F (-17.8 to -15.0°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.