What zone am I in Chicago?

Per the USDA Plant Hardiness Zone Map, Chicago and close northern suburbs are zone 6a. The lakefront areas of the city (within a mile of Lake Michigan) are zone 6b due to the lake's thermal moderation. Suburbs 20–30 miles west are zone 5b. Per University of Illinois Extension, the zone gradient can shift dramatically within a 10-mile distance in the Chicago metro area depending on proximity to Lake Michigan.

Can I grow peonies successfully in Minnesota zone 4?

Yes. Per University of Minnesota Extension, peonies are among the most cold-hardy perennials available—they are reliably hardy to zone 3 and require the cold winters that the Midwest delivers. They need at least 500 chill hours below 40°F to bloom (which the upper Midwest provides in abundance), well-drained soil, and full sun. The "eyes" (dormant buds) should be planted 1–2 inches below the soil surface—deeper planting prevents blooming. Per UMN Extension, mulch crowns lightly in zone 4 the first winter after planting.

What should I do with Japanese beetles in Illinois?

Per Illinois Extension, the most effective integrated approach for home gardens is: (1) hand-pick adults in the morning when temperatures are below 60°F and beetles are sluggish; drop into a bucket of soapy water; (2) apply chlorantraniliprole to lawn areas in June to kill grubs before they damage roots (this also reduces next year's adult population); (3) plant less-preferred species where possible — Japanese beetles show strong preference for roses, lindens, and grapes; they rarely damage ornamental grasses, conifers, or most vegetables. Per Illinois Extension, Japanese beetle traps attract more beetles to an area than they catch; do not use them.

When is the last frost date in Minneapolis?

Per NOAA climate data, the average last frost date in Minneapolis (zone 4b) is May 10–15. But per University of Minnesota Extension, this is a 50% probability date—there is a significant chance of frost after this date in any given year. Use May 20 as a more conservative working date. Do not transplant tomatoes, peppers, or other frost-sensitive crops before May 20 in zone 4b Minneapolis. —- Recommended gear: Best Floating Row Covers for Pest Exclusion (2026) — our buyer's guide covering picks for every budget, ranked by Extension publication consensus and personal use.

Home/Care/Gardening in the Midwest: Zones 4–6 Regional Guide

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Gardening in the Midwest: Zones 4–6 Regional Guide

title: "Gardening in the Midwest: Zones 4–6 Regional Guide"

Midwest residential perennial garden with hostas, daylilies, black-eyed Susan, and coneflowers along a wood-sided home — A typical Midwest home garden of layered perennials. Image: AI-generated reference.

By Thomas Joseph Published 2026-06-10 Updated 2026-06-13 Reviewed by Thomas Joseph 13 min read

The Midwest has some of the finest agricultural soil in the world and some of the most demanding gardening conditions in the continental US. The zone 4–5 northern tier (Minnesota, Wisconsin, northern Michigan) delivers winters that kill even well-established zone 5 plants in hard years. The zone 5–6 central corridor (Ohio, Indiana, Illinois, Iowa) is more forgiving but still faces compressed growing seasons, severe summer thunderstorms, and winter freeze-thaw cycles that heave poorly anchored plants from the ground.

This guide is based primarily on research from the University of Minnesota Extension, University of Illinois Extension, Ohio State University Extension, Michigan State University Extension, and Purdue University Extension (Indiana).

This article contains affiliate links. As an Amazon Associate, we earn from qualifying purchases - at no extra cost to you. We only recommend products we have personally tested or that are the universal first recommendation from university Extension publications. See our full disclosure.

USDA Zones and Regional Geography
Soil: Glacial Loam and Clay
First and Last Frost Dates
Seasonal Planting Calendar
What Grows Best in the Midwest
What Does Not Work
Pest Pressure
Disease Pressure
Native Plant Recommendations
Frequently Asked

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Gardening in the Midwest: Zones 4–6 Regional Guide

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Gardening in the Midwest: Zones 4–6 Regional Guide

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