When is the last frost in Sayreville, NJ?

The average last spring frost (50% probability of 32°F) in Sayreville is around April 15, based on NOAA/NCEI 1991–2020 normals at the New Brunswick 3 Se, NJ station (3.9 mi away). Half of years it falls outside that date, so wait 1–2 weeks past it before setting out frost-tender plants.

When is the first fall frost in Sayreville?

The average first fall frost in Sayreville, NJ is around October 26, giving roughly a 193-day frost-free growing season.

What planting zone is Sayreville, NJ?

Sayreville is in USDA plant hardiness zone 7a (average annual extreme minimum temperature 0 to 5°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Sayreville?

In Sayreville, NJ the warmest month is July (avg high 86.5°F) and the coldest is January (avg low 22.9°F). It averages about 49.5″ of precipitation a year and 29″ of snow.

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Sayreville, NJ Planting Calendar & Frost Dates

USDA hardiness zone 7a · ZIP 08872 · elevation 34′ · NOAA & USDA data

Sayreville is in USDA hardiness zone 7a (winters can dip to 0 to 5°F), with a growing season of about 193 days between the average last spring frost (April 15) and first fall frost (October 26). The warmest month is July (avg high 86.5°F); the coldest is January (avg low 22.9°F). It averages 49.5″ of precipitation a year and 29″ of snow, mostly mid-winter. Start cool-season crops several weeks before the last frost; wait until after it for tomatoes, peppers and other tender crops.

Hardiness zone

min temp 0 to 5°F

Last spring frost

April 15

avg (50% prob, 32°F)

First fall frost

October 26

avg (50% prob, 32°F)

Growing season

193 days

frost-free window

Warmest month

July

avg high 86.5°F

Month-by-month typical weather in Sayreville

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at New Brunswick 3 Se, NJ (3.9 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	40.3	22.9	31.6	3.7	8.3
February	42.8	24	33.4	3	9.3
March	50.6	31	40.8	4.4	5.2
April	62.5	40.8	51.7	3.9	0.6
May	72.1	50.6	61.3	4	0
June	81.2	60.4	70.8	4.8	0
July	86.5	65.6	76.1	4.8	0
August	84.7	64	74.3	4.7	0
September	78.4	56.5	67.4	4.2	0
October	66.5	44.2	55.4	4.1	0.2
November	55.5	35.2	45.4	3.4	0.5
December	45.4	28.4	36.9	4.5	4.9

What to plant when in Sayreville

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: March 4 · Transplant out: April 22
Peppers	warm	Start seeds indoors: February 18 · Transplant out: April 29
Cucumbers	warm	Direct sow: April 22
Zucchini / squash	warm	Direct sow: April 22
Bush beans	warm	Direct sow: April 22
Sweet corn	warm	Direct sow: April 22
Basil	warm	Transplant out: April 22
Peas	cool	Sow (spring): March 11 · Sow (fall): August 31
Spinach	cool	Sow (spring): March 4 · Sow (fall): August 31
Lettuce	cool	Sow (spring): March 18 · Sow (fall): August 31
Kale	cool	Transplant (spring): March 25 · Sow (fall): August 17
Broccoli	cool	Transplant (spring): April 1
Carrots	cool	Sow (spring): March 25 · Sow (fall): August 17
Onions	cool	Transplant (spring): March 18
Potatoes	cool	Plant seed potatoes: April 1
Radishes	cool	Sow (spring): March 18 · Sow (fall): September 14

Dates are computed from Sayreville's average frost dates using standard cool-/warm-season timing. They're a starting point — a cold spring, a warm microclimate, or a fast-maturing variety can shift them by a week or two.

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Gear that helps you plant on time

Some links below are Amazon affiliate links (tag theboringthin-20). If you buy through them we may earn a small commission at no extra cost to you — it keeps this almanac free. We only list generic, genuinely-useful categories.

Soil thermometer →Know when the ground is warm enough to sow — the honest signal, not the calendar.Seed-starting trays + dome →Start tomatoes & peppers indoors on the schedule below.Seedling heat mat →Warms the soil for faster, more even germination indoors.Floating row cover / frost cloth →Buys you 4–8°F to beat an early or late frost.Raised garden bed kit →Warms and drains faster in spring than in-ground soil.Garden gloves →Basic kit for transplant day.

Nearby cities in New Jersey

New Brunswick, NJ Perth Amboy, NJ Plainfield, NJ Linden, NJ Elizabeth, NJ Bayonne, NJ Newark, NJ East Orange, NJ

Sources & method. Hardiness zone: 2023 USDA Plant Hardiness Zone Map (PRISM Climate Group, Oregon State University). Frost dates & growing season: NOAA/NCEI 1991–2020 U.S. Climate Normals, nearest station with published freeze normals — New Brunswick 3 Se, NJ, 3.9 mi (confidence: high). Monthly weather normals: New Brunswick 3 Se, NJ, 3.9 mi (confidence: high). ZIP centroid from U.S. Census 2023 ZCTA data. Frost dates are the 50%-probability date — half of years frost occurs outside the stated date. Nothing here is invented; where the nearest station is far, we say so. Last updated 2026-07-22.