How to Know Your Growing Zone

Welcome to Peruvian Roots Farm’s Growing Guides. Here you’ll find step-by-step instructions to grow Peruvian and garden favorites—from seed to harvest. Each guide is written by our small family farm in Mansfield, Ohio, where every seed we share helps rescue and care for abandoned cats.

Understanding Your Growing Zone

If you’ve ever wondered why some plants thrive while others struggle, the answer often lies in your growing zone. Knowing your zone is the foundation of successful gardening. It tells you what plants can survive outdoors, when to plant your seeds, and how to protect your crops from frost.

What Is a Growing Zone?

A growing zone, also called a USDA Hardiness Zone, is a map created by the U.S. Department of Agriculture to show the average minimum winter temperatures across the country.
Each zone is divided by 10-degree increments. Zone 1 represents the coldest areas, while Zone 13 covers the warmest regions.

For example, here in Mansfield, Ohio, we are in Zone 6. Winters can drop to about –10°F, which means tender plants like Ají Amarillo or Rocoto must be started indoors and moved outside only after the last frost.

How to Find Your Zone

You can find your exact growing zone using the official USDA Hardiness Zone Map.

1. Visit the link above.

2. Type your ZIP code in the search bar.

3. The map will display your zone, such as “Zone 6a” or “Zone 8b.”

This number will help you determine when it’s safe to plant and which crops can survive year after year.

Why Your Growing Zone Matters

Your growing zone affects nearly every gardening decision:

• When to start seeds: Gardeners in colder zones must start seeds indoors earlier in the year, while those in warmer zones can plant directly outdoors.

• Which plants can survive winter: Perennials that thrive in Zone 9 may not survive in Zone 6 without protection.

• How to plan your harvest: Knowing your zone helps you estimate how long your growing season lasts, which is key for crops like peppers and tomatoes.

For instance, Huacatay (Tagetes minuta) tolerates light frost, but Ají Amarillo is more sensitive to cold. If you live in a northern state, it’s best to start these seeds indoors early and move them outside once temperatures warm.

From Zone to Action

Now that you know your growing zone, you can begin planning your planting calendar. Understanding your frost dates and timing is the next step toward growing strong, healthy plants.

Read our next guide: When to Start Your Seeds, where we explain how to use your zone and frost dates to know exactly when to plant indoors or outdoors.