USDA Hardiness Zone 7a
Frost Dates for 08886 — Stewartsville, New Jersey
NOAA 1991–2020 normals from Phillipsburg-Easton Brg, NJ (232 ft), 5 miles west.
Updated
In Stewartsville, the last spring frost (32°F) is around April 18 in half of years and has passed by May 5 in nine years out of ten. The first fall frost comes around October 25, as early as October 11 one year in ten, leaving a typical freeze-free season of 188 days (NOAA, Phillipsburg-Easton Brg, NJ).
- Last spring frost
- April 18
- First fall frost
- October 25
- Growing season
- 188 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
- January 8
- Last snow
- February 17
- Winters with snow
- 88%
- Snow per year
- —
median, 1991–2020
median, 1991–2020
14 of 16 observed
NOAA normal
Frost risk by date in Stewartsville
Half of springs at Phillipsburg-Easton Brg, NJ see their last 32°F night by April 18; only one in ten is past it by April 5, and one in ten still has one after May 5. Planting tender crops after April 24 leaves a 30% risk of a frost on them, after April 29 20%, and after May 5 10%. The 17 days between the even-odds date and the one-in-ten date is wider than at 64% of the 56 New Jersey stations behind this site's ZIP pages.
In fall the first 32°F night comes by October 25 in half of years, as early as October 11 one year in ten, and holds off past November 5 one year in ten. A hard freeze of 28°F follows 10 days later, around November 4; in spring the one-in-ten date for 28°F is April 18, 17 days before the 32°F one. The freeze-free season lasts 188 days in a typical year, shorter than at 64% of the 56 New Jersey stations; it reaches 206 days one year in ten and falls short of 165 one year in ten. On average 119 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 May 1, and return around October 13. Severe cold of 16°F or below comes every winter, usually between December 7 and March 6.
| Low | 90% | 80% | 70% | 60% | 50% | 40% | 30% | 20% | 10% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Apr 17 | Apr 22 | Apr 25 | Apr 28 | May 1 | May 4 | May 7 | May 11 | May 17 |
| 32°F | Apr 5 | Apr 8 | Apr 12 | Apr 15 | Apr 18 | Apr 21 | Apr 24 | Apr 29 | May 5 |
| 28°F | Mar 23 | Mar 29 | Mar 31 | Apr 2 | Apr 4 | Apr 6 | Apr 9 | Apr 12 | Apr 18 |
| 24°F | Mar 10 | Mar 16 | Mar 19 | Mar 22 | Mar 25 | Mar 29 | Mar 31 | Apr 2 | Apr 6 |
| 20°F | Mar 1 | Mar 6 | Mar 9 | Mar 13 | Mar 16 | Mar 18 | Mar 21 | Mar 24 | Mar 29 |
| 16°F | Feb 16 | Feb 24 | Feb 28 | Mar 3 | Mar 6 | Mar 9 | Mar 13 | Mar 17 | Mar 21 |
| Low | 10% | 20% | 30% | 40% | 50% | 60% | 70% | 80% | 90% |
|---|---|---|---|---|---|---|---|---|---|
| 36°F | Oct 1 | Oct 4 | Oct 7 | Oct 10 | Oct 13 | Oct 17 | Oct 20 | Oct 23 | Oct 27 |
| 32°F | Oct 11 | Oct 16 | Oct 19 | Oct 22 | Oct 25 | Oct 28 | Oct 31 | Nov 2 | Nov 5 |
| 28°F | Oct 24 | Oct 28 | Oct 31 | Nov 1 | Nov 4 | Nov 6 | Nov 9 | Nov 12 | Nov 16 |
| 24°F | Nov 2 | Nov 6 | Nov 9 | Nov 11 | Nov 13 | Nov 16 | Nov 18 | Nov 22 | Nov 28 |
| 20°F | Nov 9 | Nov 13 | Nov 17 | Nov 20 | Nov 23 | Nov 27 | Nov 30 | Dec 5 | Dec 13 |
| 16°F | Nov 17 | Nov 23 | Nov 28 | Dec 1 | Dec 7 | Dec 13 | Dec 18 | Dec 24 | Jan 1 |
Freeze probabilities 1991–2020 at Phillipsburg-Easton Brg, 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 08886 →Compare Stewartsville with another place →
Weather by month in Stewartsville
July is the warmest month at Phillipsburg-Easton Brg, NJ, averaging 86°F by day and 64°F at night; January is the coldest at 38°F and 22°F. A freezing night is all but certain in every month from November 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 16% of years.
Warmth for growing adds up to 3,197 growing degree days a year (base 50°F), fewer than at 79% of the 56 New Jersey stations. 34% of them (1,072) have built up by the end of June, and July adds the most, 764.
| Month | High °F | Low °F | 32°F night | Nights ≤ 32°F | GDD 50°F |
|---|---|---|---|---|---|
| Jan | 38 | 22 | 100% | 28 | 0 |
| Feb | 40 | 22 | 100% | 24 | 2 |
| Mar | 49 | 29 | 100% | 21 | 21 |
| Apr | 62 | 39 | 97% | 6 | 115 |
| May | 72 | 49 | 16% | <1 | 336 |
| Jun | 81 | 59 | 0% | 0 | 598 |
| Jul | 86 | 64 | 0% | 0 | 764 |
| Aug | 83 | 62 | 0% | 0 | 690 |
| Sep | 77 | 55 | 0% | 0 | 469 |
| Oct | 65 | 44 | 73% | 1 | 173 |
| Nov | 53 | 33 | 100% | 16 | 27 |
| Dec | 43 | 26 | 100% | 23 | 3 |
Monthly normals 1991–2020 at Phillipsburg-Easton Brg, NJ (232 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, Belvidere Brg, NJ, 9 miles north of Stewartsville, has a last frost 12 days later (April 30), a first frost 7 days earlier (October 18), a season 20 days shorter.
When it snows in Stewartsville, New Jersey
The first measurable snow (0.1 inch or more) in Stewartsville usually arrives around January 8, and the last of the season around February 17. Those are the middle dates across the winters of 1991–2020 at Phillipsburg-Easton Brg, NJ, 4.6 miles away: half of years saw snow earlier, half later. Snow fell in 88% of those winters. The last 32°F night of spring typically comes 60 days after the last snow.
Planting calendar for 08886
| When | What to do |
|---|---|
| February 7 – February 21 | Start peppers and aubergines indoorsThey need eight to ten weeks under lights before they can go out. |
| February 21 – March 7 | Start tomatoes indoorsSix to eight weeks gives a transplant big enough to set fruit early. |
| March 21 – April 4 | Sow peas, spinach, lettuce, radish outdoorsThese tolerate light frost and prefer to germinate in cool soil. |
| April 18 onward | Transplant tomatoes, peppers, basil, squash, cucumbersThe average last freeze has passed — still watch the actual forecast. |
| by August 2 | Sow the autumn crop of carrots, beets and brassicasThey need about twelve weeks to size up before growth stops. |
| by October 11 | Harvest tender crops, or be ready to cover themA first freeze two weeks early is well within normal variation. |
| October 25 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 08886 is 5 miles from Phillipsburg-Easton Brg, NJ, which stands at 232 feet, the nearest NOAA station that publishes freeze probabilities for 1991–2020. 8 other ZIP codes share the station; its figures are presented in full for 18042 (Easton). The 2023 USDA Plant Hardiness Zone Map lists ZIP 08886 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.