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The Extension office provides assistance and programs for the community without discrimination in five main areas: Agriculture, Horticulture, Family & Consumer Science, Natural Resources and 4-H Youth Programs.

Colorado Master Gardener Program   arrow

Ask a Master Gardener

Our volunteers are out of the office, but are still able to help you with your home gardening questions by email! Send us your detailed questions and any relevant photos of the problem plant to us at mggpa@bouldercounty.orgWe’re here to help, even when we’re working remotely!

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.

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.

New Students

Click here for information on Colorado Master Gardener (CMG) training, volunteer opportunities, and enrollment.

Training Information

Program participants hone their knowledge through 10 weeks of 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, irrigation, flower and tree care, and plant care during drought.

In Boulder County, two training sessions are offered each year:

Spring session classes (January-early April) are held one full day per week during business hours. Snow days may extend the training by another week.
Fall session classes (September-December) are held two evenings per week.


In Boulder County, Spring class applications are accepted mid September – the end of October, fall applications are accepted early June – the end of July. Apply online at 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, elementary and secondary schools, and community service programs to promote environmentally responsible horticulture throughout our community.

View the gallery below for a glimpse into a day in the life of a Colorado Master Gardener in Boulder County.

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 elementary schools, writing articles, teaching classes, and mentoring youth or other special populations, among 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.

Current & Continuing CMGs

Click here for information on the current class schedule, textbook ordering information, the online Volunteer Management System (VMS), and reappointment.

The Colorado Master Gardener (CMG) Volunteer Management System (VMS)

The Colorado Master Gardener Volunteer Management System is user-friendly, intuitive, and has many great features, including the ability to sign up for volunteer projects and continuing education events. CMGs can also report their volunteer hours and email other members through this online system.

Login page for the CMG Volunteer Management System
CMG GardenNotes #013, which explains the features and usage of the VMS

It is critical that new CMGs enter their contact information into this system when they first get access to it and that they continue to keep this information up to date, as this is the primary way we keep in touch with you regarding class logistics changes, weather-related cancellations, re-enrollment and more.


After their first year, Colorado Master Gardeners who wish to stay active in the program receive 12 hours of continuing education and give 24 hours of volunteer service per year. They must also complete an annual reappointment form and mail a $25 re-enrollment fee to the CSU Extension Boulder County office.

Continuing Colorado Master Gardeners: please make sure your physical address is up-to-date in the Volunteer Management System to ensure you receive your re-enrollment form in the mail, or click here to download the re-enrollment form to print and mail in. Electronic copies will not be accepted.

All active Colorado Master Gardeners are invited to attend special lectures and events and may re-attend basic training sessions if desired. Thank you for considering reappointment into the Colorado Master Gardener Program!

Keeping ahead of COVID-19

This rapidly evolving coronavirus (COVID-19) has imposed an unsettling, fluid situation upon our community and its businesses. While the team here still aims to maintain a “business as usual” approach, we are making a number of significant changes to our operations to account for a situation that is far from normal.