USDA Plant Hardiness Zone Map

Before you fall in love with a plant, it helps to know one number: your growing zone. The USDA Plant Hardiness Zone Map divides the country into zones based on average winter lows, and that single number tells you whether a tree, shrub, or perennial can live outside through your winter or will sulk and die back the first hard freeze. Find your zone below, then shop with confidence knowing the plant you pick is built for where you garden.

What Is a USDA Hardiness Zone?

The USDA divides North America into 13 zones based on the average lowest winter temperature in each area. Each zone covers a 10-degree Fahrenheit band, and each is split into "a" and "b" halves that cover 5 degrees each. Zone 3 is bitter cold; zone 11 barely sees frost. When we say a plant is "hardy to zone 5," we mean it can survive the average winter low of that zone, roughly minus 20 degrees Fahrenheit.

Here in the Mid-Atlantic, most of us garden in zone 7, with pockets of 6b and 8a depending on how close you are to the coast or the mountains. That's a generous, forgiving climate: cold enough for plants that need a real winter's rest, mild enough for a wide range of trees, shrubs, and perennials.

How to Find Your Growing Zone

Finding your zone takes about thirty seconds:

1. Look up your zip code on the official USDA Plant Hardiness Zone Map.
2. Note the zone number (and the "a" or "b" half) it returns for your address.
3. Match that number against the "hardiness zone" listed on any plant you're considering. If your zone falls inside the plant's range, it can overwinter for you.

Every plant we sell lists its hardiness range right on the product page, so once you know your number you can shop the whole catalog and skip anything that won't make it through your winter.

What Your Zone Tells You (and What It Doesn't)

Your hardiness zone answers one question well: will this plant survive my average winter? It's the first filter, and the most important one. But it isn't the whole story, and a few other factors decide whether a plant merely survives or truly thrives:

• Microclimates. A south-facing wall, a low frost pocket, or a spot shielded from wind can shift your effective zone by half a step in either direction. Gardeners in zone 7 often overwinter a tender zone 8 plant against a warm foundation.
• Summer heat. Hardiness covers winter cold, not summer highs. A plant hardy in your zone can still struggle if your summers run hotter or more humid than it likes.
• Sun, soil, and water. The right light, drainage, and moisture matter as much as temperature. A zone-appropriate plant in the wrong spot still won't be happy.

Think of your zone as the entry ticket. Once a plant clears it, use the rest of the details on the product page (sun needs, mature size, soil preferences) to make the final call.

Shop Plants Proven for Your Zone

Because we're rooted in Maryland's zone 7, the trees, shrubs, and perennials we grow are ready for real Mid-Atlantic winters, and most are hardy across a wide band of zones so gardeners around the country can plant them with confidence. Start with a category and check each plant's hardiness range as you browse:

• Anchor the yard with a tree that fits your space and climate.
• Build structure and privacy with shrubs.
• Fill in color that returns year after year with perennials.

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Growing Zone FAQs