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The Extension office provides assistance and programs for the community without discrimination in five main areas: 4-H Youth Programs, Agriculture, Community Health, Horticulture, and Small Acreage Management.

Colorado Master Gardener Program   arrow

Ask a Master Gardener

Our volunteers are staffing the in-office Help Desk on Monday and Thursday, and virtually on Friday from 9-1 March through October. Call: (303) 678-6388 with your questions.

Kyna at our first Master Gardener help desk of 2023.

Volunteers are checking email all year round. Home horticulture questions can be sent to any time. 

Let’s Grow Together

­ Grow & Give: Colorado Master Gardener

Your information source for gardening and horticulture related programs and classes through Boulder County Extension. For additional information on gardening, link to Planttalk Colorado below AND see Online Publications.

Events & Opportunities

We will be accepting applications for a limited number of openings in the Apprentice program. Applications will be available on the CSU Extension CMG website statewide in September.

Interested in Converting Your Lawn

Turfgrass removal and replanting is a popular topic. Lawn Conversion – PlantTalk Colorado ( Contact your Boulder County Colorado Master Gardener volunteers if you have questions!

Grow with Us

The Colorado Master Gardener Program in Boulder County:

Are you interested in gaining knowledge and helping others? If yes, the Colorado Master Gardener program is for you!

Participants receive intensive training in horticulture in exchange for a small tuition fee plus 50 hours of volunteer service answering gardening questions, teaching classes, mentoring special populations, writing articles, and maintaining demonstration sites. Alternately, those with limited time may choose to receive a Colorado Gardener Certificate, which provides the same training with no volunteer commitment for a higher class fee.

The Colorado Master Gardener/Gardener Certificate program is a great way to give back to your community and enhance your home garden, and is also an ideal stepping-stone toward a career in horticulture. The program is recognized by the Green Industry as an excellent vocational education course; many people considering a career in horticulture start with Colorado Master Gardener training as an all-around introduction to advanced plant care.

Training Information

Program participants hone their knowledge through classes in horticulture taught by Colorado State University professors, specialists, and agents. Beginning with basic botany, the program focuses on plant health issues such as soil composition, plant selection and care, disease diagnosis, and insect identification and control. Topics include water-wise gardening, home vegetable and fruit production, turf management, integrated pest management, irrigation, flower and tree care, and other topics.

The course is taught online through CSU with live review sessions and opportunities for local in-person labs supporting the content.


Applications are housed on the CSU Extension Colorado Master Gardener website. Information about course schedules and other FAQs can also be found there. Become a Master Gardener


Our printed information is obtained online and required. It is up to you to decide which book format is best for your learning style, acquire it prior to class, and be prepared for class each day.

Volunteer/Community Greening Projects

The Colorado Master Gardener Program in Boulder County works to match volunteer interests, skills and schedules with ideal community greening projects. We combine partnerships with the Green Industry, local groups and community service programs to promote environmentally responsible horticulture throughout our community.

In their first year, Colorado Master Gardener apprentices provide 50 hours of volunteer time to the program during the first growing season following their classes. Volunteers help the community by staffing the Master Gardener office, staffing clinic sites at nurseries and garden centers on weekends, working with the public at special events, teaching classes, and many other activities.

Colorado Master Gardener Qualifications & Enrollment

A desire to help others learn about gardening is the number one requirement for becoming a Colorado Master Gardener! While this is not a beginning gardening program, and having some Colorado gardening experience is required, you don’t have to be a gardening expert to join us.