Frost dates for Somerville Somerset Ap, New Jersey
Half of years have their last spring frost by April 26 — but 1 year in 10 still frosts after May 13.
Every other site gives you one date. A frost date is not a date: it is a percentile from 30 years of records at a nearby weather station, and planting to the median means losing the crop in half of years. Both numbers are below, so you can choose the risk yourself.
The odds
Last spring frost
- Frost this late in 1 year in 10
- May 13
- 1 year in 5
- May 7
- 3 years in 10
- May 2
- 2 years in 5
- April 29
- Half of years (the median)
- April 26
First fall freeze
- Freeze this early in 1 year in 10
- October 5
- 1 year in 5
- October 9
- 3 years in 10
- October 12
- 2 years in 5
- October 15
- Half of years (the median)
- October 18
- Growing season
- about 176 days
- Hardiness zones nearby
- 6b, 7a
Where these numbers come from
NOAA NCEI 1991–2020 Climate Normals, station Somerville Somerset Ap (USW00054785), at 40.62, -74.67. These are that station's own records, unshifted. The further your garden is from it, the less exactly they describe your ground — the planner resolves the nearest station to your own ZIP and lowers its confidence with distance, rather than presenting one number as if it were measured in your yard.
Cold air also pools in low ground on the clear, still nights when frost happens, so a hollow can freeze while a slope a hundred metres away does not. No table can know that about your garden. Your own logged frosts eventually can.
ZIP codes nearest this station
07059, 07060, 07062, 07063, 07069, 07080, 07803, 07828, 07830, 07836, 07840, 07847, 07850, 07852, 07853, 07857, 07865, 07869, 07870, 07874, 07876, 07920, 07921, 07922, 07924, 07926, 07930, 07931, 07933, 07934, 07935, 07939, 07945, 07946, 07960, 07970, 07976, 07977, 07979, 07980, 08502, 08801, 08805, 08807, 08809, 08812, 08820, 08821, 08822, 08823, 08824, 08826, 08829, 08833, 08835, 08836, 08844, 08846, 08853, 08854, 08858, 08869, 08873, 08876, 08880, 08887, 08889, 08890, 08904.
What can I plant here, and when? →
Nearby stations
The nearest stations, and how their last-frost dates compare — the frost gradient across your area, which no single station shows.
- Trenton State College, NJ — last frost by April 17
- Phillipsburg-Easton Brg, NJ — last frost by April 18
- Harrison, NJ — last frost by April 4
- Freehold-Marlboro, NJ — last frost by April 17
- Wanaque Raymond Dam, NJ — last frost by April 19
- Willow Grove Nas, PA — last frost by April 11
Other stations in New Jersey.
- Sussex 3 Wnw, NJ — last frost by April 30
- Indian Mills 2 W Hcn, NJ — last frost by April 28
- Millville Muni Ap, NJ — last frost by April 24