Frost Dates for Warren, MI 48089

Last spring frost May 1 · First fall frost October 20 · 172 frost-free days · USDA Zone 6b

Frost probability for 48089

Frost10%50%90%
Spring (last frost)May 15May 1April 17
Fall (first frost)October 3October 20November 5

Dates come from NOAA 1971–2000 freeze probabilities at the nearest reporting station (21.1 km away); the 50% date is the median year.

Frost dates by ZIP code in Warren, MI

ZIPLast spring frost (50%)First fall frost (50%)Zone
48089May 1October 206b
48091May 1October 206b
48092May 1October 206b
48093May 1October 206b
48088May 1October 206b

Month by month in Warren

MonthWhat to do
JanuaryPlan your garden layout and order seeds. Research varieties suited to your frost dates.
FebruaryStart the slowest-growing crops indoors: onions, leeks, and celery (10–12 weeks before last frost).
MarchStart peppers and eggplant indoors 8–10 weeks before your last frost (around May 1). Start tomatoes about two weeks later, 6–8 weeks before last frost.
AprilStart herbs, basil, and squash indoors (4–6 weeks before frost). Direct sow peas, spinach, and lettuce if soil is workable.
MayLast frost around May 1. Transplant cold-hardy crops (broccoli, kale, cabbage). Harden off tomato and pepper seedlings.
JuneFrost has passed. Transplant tomatoes, peppers, and basil outdoors. Direct sow beans, cucumbers, squash, and zucchini.
JulySuccession plant lettuce and greens. Keep beds weeded and watered consistently.
AugustHarvest regularly to encourage production. Monitor for pests and disease.
SeptemberFirst fall frost approaching (around October 20). Transplant fall brassicas. Sow spinach, arugula, and radishes.
OctoberFirst frost around October 20. Harvest tomatoes and peppers before frost. Cover cold-hardy crops with row covers to extend the season.
NovemberHarvest remaining cold-hardy crops: kale, carrots, and beets. Plant garlic bulbs for next year.
DecemberClean up spent plants. Add compost to beds. Rest, review, and plan next year's garden.

What grows in a 172-day season

Frequently Asked Questions

What is the last frost date for Warren, MI (ZIP 48089)?

The median last spring frost date for Warren, MI (ZIP code 48089) is around May 1. This is the 50th-percentile date — meaning half of all years see frost end before this date. Use the 10% and 90% dates to understand the full range of risk in your area.

What is the first fall frost date in Warren, MI?

The median first fall frost date for Warren, MI is around October 20. Plan to harvest or protect frost-sensitive crops like tomatoes and peppers at least a week before this date to avoid losses.

How long is the growing season in Warren, MI?

The frost-free growing season in Warren is about 172 days. This window — from your last spring frost to your first fall frost — is when warm-season vegetables thrive. Cold-hardy crops like kale, spinach, and peas can extend your season by weeks on either side.

What USDA hardiness zone is Warren, MI?

Based on frost date patterns, Warren falls approximately in 6b. USDA hardiness zones are determined by average annual minimum winter temperatures and guide both plant selection and planting timing for your location.

When should I start tomatoes indoors in Warren, MI?

Start tomato seeds indoors 6–8 weeks before your last frost date (around May 1). For Warren, that's roughly March 6 to March 20. Transplant outdoors 1–2 weeks after your last frost.

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