When is the last frost in Baltimore, MD?

The average last spring frost (50% probability of 32°F) in Baltimore is around March 24, based on NOAA/NCEI 1991–2020 normals at the Md Sci Ctr Baltimore, MD station (1.2 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 Baltimore?

The average first fall frost in Baltimore, MD is around November 21, giving roughly a 244-day frost-free growing season.

What planting zone is Baltimore, MD?

Baltimore is in USDA plant hardiness zone 8a (average annual extreme minimum temperature 10 to 15°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Baltimore?

In Baltimore, MD the warmest month is July (avg high 90.1°F) and the coldest is January (avg low 30°F). It averages about 43.7″ of precipitation a year.

Home › Maryland › Baltimore

Baltimore, MD Planting Calendar & Frost Dates

USDA hardiness zone 8a · ZIP 21201 · elevation 6′ · NOAA & USDA data

Baltimore is in USDA hardiness zone 8a (winters can dip to 10 to 15°F), with a growing season of about 244 days between the average last spring frost (March 24) and first fall frost (November 21). The warmest month is July (avg high 90.1°F); the coldest is January (avg low 30°F). It averages 43.7″ of precipitation a year. 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 10 to 15°F

Last spring frost

March 24

avg (50% prob, 32°F)

First fall frost

November 21

avg (50% prob, 32°F)

Growing season

244 days

frost-free window

Warmest month

July

avg high 90.1°F

Month-by-month typical weather in Baltimore

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Md Sci Ctr Baltimore, MD (1.2 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	43.7	30	36.9	3.1	–
February	46.8	31.9	39.4	2.8	–
March	55.2	38.7	46.9	3.9	–
April	66.8	48.2	57.5	3.6	–
May	75.9	58	67	3.4	–
June	85.4	67.7	76.6	3.4	–
July	90.1	72.9	81.5	4.7	–
August	87.3	71	79.1	4.4	–
September	80.4	64.5	72.5	4.5	–
October	68.8	52.6	60.7	3.5	–
November	57.6	42.6	50.1	3	–
December	48	34.6	41.3	3.7	–

What to plant when in Baltimore

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: February 10 · Transplant out: March 31
Peppers	warm	Start seeds indoors: January 27 · Transplant out: April 7
Cucumbers	warm	Direct sow: March 31
Zucchini / squash	warm	Direct sow: March 31
Bush beans	warm	Direct sow: March 31
Sweet corn	warm	Direct sow: March 31
Basil	warm	Transplant out: March 31
Peas	cool	Sow (spring): February 17 · Sow (fall): September 26
Spinach	cool	Sow (spring): February 10 · Sow (fall): September 26
Lettuce	cool	Sow (spring): February 24 · Sow (fall): September 26
Kale	cool	Transplant (spring): March 3 · Sow (fall): September 12
Broccoli	cool	Transplant (spring): March 10
Carrots	cool	Sow (spring): March 3 · Sow (fall): September 12
Onions	cool	Transplant (spring): February 24
Potatoes	cool	Plant seed potatoes: March 10
Radishes	cool	Sow (spring): February 24 · Sow (fall): October 10

Dates are computed from Baltimore'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.

Want the exact dates for your yard? →
Look up your precise ZIP-code frost dates and a full 26-crop planting calendar on our free interactive tool.
Open the frost & planting tool

🌾 Get a frost reminder

One email in early spring and early fall with the dates for your area. No spam.

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 Maryland

Annapolis, MD Bowie, MD Gaithersburg, MD Rockville, MD Frederick, MD Hagerstown, MD

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 — Md Sci Ctr Baltimore, MD, 1.2 mi (confidence: high). Monthly weather normals: Md Sci Ctr Baltimore, MD, 1.2 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.