When is the last frost in Flint, MI?

The average last spring frost (50% probability of 32°F) in Flint is around May 3, based on NOAA/NCEI 1991–2020 normals at the Flint 7w, MI station (4.4 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 Flint?

The average first fall frost in Flint, MI is around October 13, giving roughly a 162-day frost-free growing season.

What planting zone is Flint, MI?

Flint is in USDA plant hardiness zone 6a (average annual extreme minimum temperature -10 to -5°F), from the 2023 USDA Plant Hardiness Zone Map.

What is the weather like in Flint?

In Flint, MI the warmest month is July (avg high 81.9°F) and the coldest is January (avg low 16°F). It averages about 32.9″ of precipitation a year and 40.4″ of snow.

Home › Michigan › Flint

Flint, MI Planting Calendar & Frost Dates

USDA hardiness zone 6a · ZIP 48502 · elevation 207′ · NOAA & USDA data

Flint is in USDA hardiness zone 6a (winters can dip to -10 to -5°F), with a growing season of about 162 days between the average last spring frost (May 3) and first fall frost (October 13). The warmest month is July (avg high 81.9°F); the coldest is January (avg low 16°F). It averages 32.9″ of precipitation a year and 40.4″ 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 -10 to -5°F

Last spring frost

May 3

avg (50% prob, 32°F)

First fall frost

October 13

avg (50% prob, 32°F)

Growing season

162 days

frost-free window

Warmest month

July

avg high 81.9°F

Month-by-month typical weather in Flint

Average conditions from the NOAA/NCEI 1991–2020 U.S. Climate Normals at Flint 7w, MI (4.4 mi away). Temperatures °F, precipitation & snow in inches.

Month	Avg high	Avg low	Mean	Precip (in)	Snow (in)
January	30.4	16	23.2	2.2	13.1
February	32.7	16.4	24.6	1.7	10.4
March	42.9	23.8	33.4	1.9	4.3
April	56.4	34.6	45.5	3.4	1.2
May	68.2	46.1	57.2	3.7	0
June	77.8	56.4	67.1	3.1	0
July	81.9	60.2	71.1	3.4	0
August	79.1	59.2	69.2	3.3	0
September	72.7	50.7	61.7	2.9	0
October	59.8	39.8	49.8	3	0.1
November	46.8	30.3	38.6	2.4	1.7
December	35.2	22	28.6	2.1	9.6

What to plant when in Flint

Crop	Season	What to do & when
Tomatoes	warm	Start seeds indoors: March 22 · Transplant out: May 10
Peppers	warm	Start seeds indoors: March 8 · Transplant out: May 17
Cucumbers	warm	Direct sow: May 10
Zucchini / squash	warm	Direct sow: May 10
Bush beans	warm	Direct sow: May 10
Sweet corn	warm	Direct sow: May 10
Basil	warm	Transplant out: May 10
Peas	cool	Sow (spring): March 29 · Sow (fall): August 18
Spinach	cool	Sow (spring): March 22 · Sow (fall): August 18
Lettuce	cool	Sow (spring): April 5 · Sow (fall): August 18
Kale	cool	Transplant (spring): April 12 · Sow (fall): August 4
Broccoli	cool	Transplant (spring): April 19
Carrots	cool	Sow (spring): April 12 · Sow (fall): August 4
Onions	cool	Transplant (spring): April 5
Potatoes	cool	Plant seed potatoes: April 19
Radishes	cool	Sow (spring): April 5 · Sow (fall): September 1

Dates are computed from Flint'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 Michigan

Saginaw, MI Pontiac, MI Novi, MI Southfield, MI East Lansing, MI Troy, MI Sterling Heights, MI Royal Oak, MI

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 — Flint 7w, MI, 4.4 mi (confidence: high). Monthly weather normals: Flint 7w, MI, 4.4 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.