When is the last frost in Manassas, VA?

The average last spring frost (50% probability of 32°F) in Manassas is around April 12, based on NOAA/NCEI 1991–2020 normals at the Manassas, VA station (4.7 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 Manassas?

The average first fall frost in Manassas, VA is around October 27, giving roughly a 197-day frost-free growing season.

What planting zone is Manassas, VA?

Manassas 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 Manassas?

In Manassas, VA the warmest month is July (avg high 87.6°F) and the coldest is January (avg low 25.2°F). It averages about 43.2″ of precipitation a year and 21″ of snow.

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Manassas, VA Planting Calendar & Frost Dates

USDA hardiness zone 7a · ZIP 20109 · elevation 88′ · NOAA & USDA data

Manassas is in USDA hardiness zone 7a (winters can dip to 0 to 5°F), with a growing season of about 197 days between the average last spring frost (April 12) and first fall frost (October 27). The warmest month is July (avg high 87.6°F); the coldest is January (avg low 25.2°F). It averages 43.2″ of precipitation a year and 21″ 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 12

avg (50% prob, 32°F)

First fall frost

October 27

avg (50% prob, 32°F)

Growing season

197 days

frost-free window

Warmest month

July

avg high 87.6°F

Month-by-month typical weather in Manassas

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Washington Dc Dulles Ap, VA (10.8 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	42.6	25.2	33.9	2.9	6.9
February	46.1	26.7	36.4	2.6	7
March	54.8	33.6	44.2	3.5	3.9
April	66.8	43.2	55	3.5	0.1
May	75	53	64	4.7	0
June	83.1	61.9	72.5	4.3	0
July	87.6	66.8	77.2	4.2	0
August	86.3	65.2	75.7	3.5	0
September	79.3	57.9	68.6	3.9	0
October	67.8	45.3	56.6	3.7	0
November	56.5	35.6	46	3.1	0.3
December	46.5	29	37.7	3.3	2.8

What to plant when in Manassas

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: March 1 · Transplant out: April 19
Peppers	warm	Start seeds indoors: February 15 · Transplant out: April 26
Cucumbers	warm	Direct sow: April 19
Zucchini / squash	warm	Direct sow: April 19
Bush beans	warm	Direct sow: April 19
Sweet corn	warm	Direct sow: April 19
Basil	warm	Transplant out: April 19
Peas	cool	Sow (spring): March 8 · Sow (fall): September 1
Spinach	cool	Sow (spring): March 1 · Sow (fall): September 1
Lettuce	cool	Sow (spring): March 15 · Sow (fall): September 1
Kale	cool	Transplant (spring): March 22 · Sow (fall): August 18
Broccoli	cool	Transplant (spring): March 29
Carrots	cool	Sow (spring): March 22 · Sow (fall): August 18
Onions	cool	Transplant (spring): March 15
Potatoes	cool	Plant seed potatoes: March 29
Radishes	cool	Sow (spring): March 15 · Sow (fall): September 15

Dates are computed from Manassas'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 Virginia

Leesburg, VA Alexandria, VA Charlottesville, VA Harrisonburg, VA Richmond, VA Lynchburg, VA Newport News, VA Hampton, VA

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 — Manassas, VA, 4.7 mi (confidence: high). Monthly weather normals: Washington Dc Dulles Ap, VA, 10.8 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.