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Johnson County

Research-based Information You Can Trust — Localized for your needs

Johnson County
11811 S. Sunset Drive
Suite 1500
Olathe, KS 66061

Office Hours:

Monday - Friday,
8:30 a.m. - 5 p.m.

(913) 715-7000
(913) 715-7005 fax

Map to our office

K-State Research and Extension is committed to making its services, activities and programs accessible to all participants. Reasonable accommodations for persons with disabilities may be requested by contacting Johnson County Extension at (913)715-7000. Notify staff of accommodation needs as early as possible.

Kansas State University Agricultural Experiment Station and Cooperative Extension Service

K-State Research and Extension is an equal opportunity provider and employer.

Bringing K-State to Johnson County

Here at the K-State Johnson County Extension Office, we pledge to serve our community in a variety of ways, from health and nutrition, to agricultural and horticultural needs, money management, and much more. We exist to help others through Kansas State University knowledge and information in order to better serve our communities, specializing in problem-solving, education, and community service. 

Since 1917, the Johnson County Extension Office has dedicated our time and resources to ensure that the community of Johnson County continues to grow and thrive.

Volunteer with Extension

Applications are now open for the next class of Extension Master Gardeners (apply by June 28), as well as Extension Master Food Volunteers (apply by July 17).

Explore additional volunteer opportunities here.

Do I Need a Soil Test?

Soil fertility is important for good plant growth. Testing is the only way to know nutrient levels.

A test gives you accurate informa­tion about the type and amount of fertilizer or amendment to apply. Applying proper amounts decreases runoff that can pollute waterways. This protects the envi­ronment and saves you money.

A soil test measures pH and available nutrients.Johnson County homeowners are eligible to receive one free test (Package #1)  per household per calendar year.

Proper collection of a soil sample is important for accuracy and analysis. Follow these steps for taking good samples.

Upcoming Events!

how to read nature

Wild Kids! How to Read Nature

Saturday, June 8 
Kids ages 7-14 can explore nature while learning to observe signs of wildlife, learn how to navigate nature using a compass, and distinguish similarities and differences among Prairie, Wetland, and Forest habitats. Learn more

Silver Clovers has returned!

silver clovers"Your actions today affect your physical and mental future; they impact your longevity and quality of life." 

Check out our classes and programs for adults ages 50 and up in Johnson County!