How to Find Your Local Cooperative Extension Office

Woman examining lettuce crops in an open field.
My Garden Life
June 16, 2025
Table of Contents

An extension office is an organization that connects citizens to local experts and resources on areas like agriculture, gardening, landscaping, and pest control. Nearly every US county has its own cooperative extension office.

Gardeners are often advised to contact their local extension office for advice. However, many gardeners aren’t clear on what exactly an extension office is, and they aren’t sure how to connect with their local office.

You can find your state’s extension office homepage in this USDA directory. But before you go there here’s some information about how extension offices work, how to connect with your local office, and what benefits these organizations provide for gardeners.

History of the Cooperative Extension Office System

The Cooperative Extension System (CES) is a network of offices around the US that provide farmers, young people, and the general public with educational opportunities in agriculture and related areas. CES offices are administered by land grant universities, with support from the USDA.

A land grant university is an institution that receives federal funding to provide benefits for the general public—not just for their enrolled students. There are 112 land grant universities that were established as a result of the Morrill Act of 1862.

This act, signed into law by President Lincoln, provided lands that could be sold to fund the creation of universities to teach agriculture, mechanical, and other technical subjects. These now include many of the nation’s most prominent schools offering degree programs in agriculture, such as Michigan State University, Ohio State University, Texas A&M, and Cornell University.

The old brick university hall on the campus of Ohio State University, one of many land grant universities with a cooperative extension office.

Land grant universities run state-level cooperative extension offices. Universities also serve as the parent groups for around 2,900 local extension offices. A local office typically serves a single county.

Much of the most important agricultural research in the US takes place in land grant universities. Thus, these institutions are staffed with experts on topics like planting methods, water conservation, and pest management. Through extension offices, land-grant universities extend their knowledge to the public through educational programs, workshops, and written materials.

Michigan cooperative extension agent assisting a grower with pest identification in an orchard.

An extension office typically has a physical location, a website, and a publicly available staff directory.

Extension office services vary from county to county, but often include:

  • 4-H youth development programs.
  • Public health programs.
  • Family and consumer science (FCS) programs.
  • Educational programs and resources on agriculture, pest control, and gardening.

Finding Your Local Extension Office

To find your local extension office, just enter “<your county name> extension office” into a search engine.

Your extension office’s website may provide a list of email addresses and phone numbers to help direct you to the staff member (known as an extension agent) who’s best qualified to assist you. 

Rather than your county office, you may choose to contact your state extension office. On the state office website, you’ll find articles and guides, research updates, and statewide opportunities for volunteering and education.

Use this interactive USDA directory to find your state’s office.

Two men with digital tablets discussing trees in an almond orchard.

How Cooperative Extension Offices Help Gardeners

No matter where you live in the US, you have a state and local extension office that serves your region. The staff at these offices are excellent sources of knowledge and guidance for gardeners. Usually, it’s easy to get in touch with an agent. Just check the office’s website for a contact form or a phone number.

If your local office isn’t responsive, try the neighboring county’s office or the state office. You can also try the Cooperative Extension Service’s public Q&A forum, Ask Extension.

Here are a few more public benefits offered by many cooperative extension offices.

Blog Articles and Guides

Many state extension office websites post blog articles and guides on gardening and landscaping topics. These posts are research-based, written by experts, and focused on your local region.

Woman sitting at a shady patio table using a laptop surrounded by outdoor plants.

Soil Testing

Some gardeners have their soil tested to determine its pH value, along with the levels of essential nutrients like potassium and phosphorous. This service is available at some extension offices (sometimes for free, usually for a fee). Even if your local office doesn’t offer soil testing, they can direct you to a trusted provider.

Blue gloved hands with a garden trowel digging soil samples and placing them in plastic bags.

4-H

The Cooperative Extension System’s main youth outreach program is 4-H. Serving youths from ages 8–18, 4-H programs promote citizenship and science education.

4-H has a special emphasis on experiential agricultural education, through events like science fairs and Giant Pumpkin Contests. If you’re interested in helping a young person develop their interest in gardening, farming, or science, your local extension office’s 4-H agent is a good person to talk to.

Two young girls feeding hens inside a chicken coop.

Master Gardener Programs

Every state extension office runs a Master Gardener program. To become a Master Gardener, a gardener completes a training course that covers topics like growing vegetables, soil science, and weed management. After completing their training, Master Gardeners can serve as qualified volunteers and instructors at local gardening events.

Use this search tool to find your state’s Master Gardener program.

A smiling woman picking a red pepper surrounded by a beautiful raised vegetable garden.

Classes, Workshops, and Volunteer Opportunities

Extension offices regularly offer gardening workshops and courses for the public. These are great opportunities to learn from local experts. Extension offices also offer opportunities for volunteering, such as 4-H fairs, tree planting events, and invasive plant removal workdays.

Volunteers planting a tree in a public space.

Support for Native Planting and Eco-Friendly Gardening

If you’re interested in gardening or landscaping with native plants, your local extension office may be able to help. The staff may include an expert on your region’s native plants and ecosystems. These agents can provide species recommendations and planting tips.

Sometimes, extension offices even give away or sell native starter plants or seeds. They may also provide assistance with other eco-friendly gardening practices, such as composting or rainwater harvesting.

Close up of pots with tags for starting native plant seedlings.

Other Helpful Resources for Gardeners

Extension offices are a wonderful source of assistance for gardeners. They offer unique opportunities for connecting with experts who understand the growing conditions in your local area.

Another great place to find helpful gardening resources is right here at My Garden Life! Whenever you’re planning a gardening project, don’t forget to consult our Plant Library, Zone Finder, and Frost Map tools. Plus, enjoy our weekly articles on all sorts of fascinating gardening topics.

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