USDA Hardiness Zone 7a
Frost Dates for 07111 — Irvington, New Jersey
NOAA 1991–2020 normals from Newark International Airport, NJ (7 ft), 4 miles southeast.
Updated
In Irvington, the last spring frost (32°F) is around April 2 in half of years and has passed by April 15 in nine years out of ten. The first fall frost comes around November 10, as early as October 28 one year in ten, leaving a typical freeze-free season of 222 days (NOAA, Newark International Airport, NJ).
- Last spring frost
- April 2
- First fall frost
- November 10
- Growing season
- 222 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 9
- Last snow
- March 21
- Winters with snow
- 100%
- Snow per year
- 31.5"
median, 1991–2020
median, 1991–2020
30 of 30 observed
NOAA normal
Frost risk by date in Irvington
Half of springs at Newark International Airport, NJ see their last 32°F night by April 2; only one in ten is past it by March 20, and one in ten still has one after April 15. Planting tender crops after April 6 leaves a 30% risk of a frost on them, after April 9 20%, and after April 15 10%. The 13 days between the even-odds date and the one-in-ten date is narrower than at 82% of the 56 New Jersey stations behind this site's ZIP pages.
In fall the first 32°F night comes by November 10 in half of years, as early as October 28 one year in ten, and holds off past November 25 one year in ten. A hard freeze of 28°F follows 12 days later, around November 22; in spring the one-in-ten date for 28°F is April 4, 11 days before the 32°F one. The freeze-free season lasts 222 days in a typical year, longer than at 86% of the 56 New Jersey stations; it reaches 243 days one year in ten and falls short of 202 one year in ten. On average 80 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 11 days longer, to about April 13, and return around October 30. Severe cold of 16°F or below comes in 99% of winters, usually between January 1 and February 18.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 1 | Apr 4 | Apr 7 | Apr 10 | Apr 13 | Apr 16 | Apr 19 | Apr 23 | Apr 29 |
| 32°F | Mar 20 | Mar 25 | Mar 29 | Mar 31 | Apr 2 | Apr 3 | Apr 6 | Apr 9 | Apr 15 |
| 28°F | Mar 8 | Mar 13 | Mar 17 | Mar 20 | Mar 23 | Mar 26 | Mar 30 | Mar 31 | Apr 4 |
| 24°F | Feb 25 | Mar 3 | Mar 7 | Mar 10 | Mar 13 | Mar 16 | Mar 18 | Mar 22 | Mar 27 |
| 20°F | Feb 12 | Feb 20 | Feb 25 | Mar 1 | Mar 4 | Mar 7 | Mar 10 | Mar 14 | Mar 19 |
| 16°F99% of yrs | Jan 27 | Feb 2 | Feb 8 | Feb 13 | Feb 18 | Feb 24 | Feb 28 | Mar 3 | Mar 9 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 17 | Oct 21 | Oct 25 | Oct 27 | Oct 30 | Nov 1 | Nov 4 | Nov 7 | Nov 12 |
| 32°F | Oct 28 | Nov 1 | Nov 4 | Nov 7 | Nov 10 | Nov 13 | Nov 16 | Nov 20 | Nov 25 |
| 28°F | Nov 8 | Nov 12 | Nov 16 | Nov 19 | Nov 22 | Nov 25 | Nov 30 | Dec 3 | Dec 8 |
| 24°F | Nov 18 | Nov 24 | Nov 28 | Dec 1 | Dec 4 | Dec 7 | Dec 10 | Dec 15 | Dec 22 |
| 20°F | Nov 30 | Dec 5 | Dec 9 | Dec 14 | Dec 18 | Dec 22 | Dec 26 | Dec 31 | Jan 6 |
| 16°F99% of yrs | Dec 12 | Dec 21 | Dec 25 | Dec 29 | Jan 1 | Jan 4 | Jan 8 | Jan 14 | Jan 23 |
Freeze probabilities 1991–2020 at Newark International Airport, 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 07111 →Compare Irvington with another place →
Weather by month in Irvington
July is the warmest month at Newark International Airport, NJ, averaging 87°F by day and 69°F at night; January is the coldest at 40°F and 26°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 57% of years.
Warmth for growing adds up to 3,879 growing degree days a year (base 50°F), more than at 91% of the 56 New Jersey stations. 33% of them (1,289) have built up by the end of June, and July adds the most, 873. Precipitation totals 46.6 inches a year, most in July (4.7") and least in February (3.0"); 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 | 26 | 3.4 | 100% | 23 | 4 |
| Feb | 43 | 27 | 3.0 | 100% | 20 | 6 |
| Mar | 51 | 34 | 4.1 | 99% | 12 | 32 |
| Apr | 63 | 44 | 3.9 | 57% | 1 | 155 |
| May | 73 | 54 | 4.0 | 0% | 0 | 412 |
| Jun | 82 | 64 | 4.3 | 0% | 0 | 681 |
| Jul | 87 | 69 | 4.7 | 0% | 0 | 873 |
| Aug | 85 | 68 | 4.2 | 0% | 0 | 817 |
| Sep | 78 | 61 | 3.8 | 0% | 0 | 576 |
| Oct | 66 | 49 | 3.8 | 16% | <1 | 252 |
| Nov | 55 | 39 | 3.3 | 95% | 6 | 61 |
| Dec | 45 | 31 | 4.1 | 100% | 18 | 12 |
Monthly normals 1991–2020 at Newark International Airport, NJ (7 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, Harrison, NJ, 4 miles east of Irvington, has a last frost 2 days later (April 4), a first frost 4 days earlier (November 6), a season 6 days shorter.
When it snows in Irvington, New Jersey
The first measurable snow (0.1 inch or more) in Irvington usually arrives around December 9, and the last of the season around March 21. Those are the middle dates across the winters of 1991–2020 at Newark International Airport, NJ, 4.4 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 12 days after the last snow.
Planting calendar for 07111
| When | What to do |
|---|---|
| January 22 – February 5 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 5 – February 19 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 5 – March 19 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 2 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by August 18 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 27 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| November 10 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 07111 is 4 miles from Newark International Airport, NJ, which stands at 7 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 18 other ZIP codes share the station; its figures are presented in full for 10314 (Staten Island). The 2023 USDA Plant Hardiness Zone Map lists ZIP 07111 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.