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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.

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Your Information Source for Home Gardening, Landscape & Professional Horticulture

The Master Gardener help desk in Boulder County is open for phone calls, emails. Email them to, or contact by phone at 303-678-6388. Get help from a wide variety of Online Publications, our Ask an Expert option is a nation-wide volunteer program designed to answer all of your gardening questions, horticulture blogs through the CSU Extension community, Planttalk Colorado™ videos and more. We offer Plant Diagnostic Services, Green Industry support, HOA site visits, Lawn Check and Tree Team visits as well.

The Boulder County Fairgrounds has several demonstration gardens, a community garden and various trial plots to visit. All are free and open to the public from dawn till dusk.

Would you like landscape guidance for your HOA or business? We offer support for the Green Industry with expert advice, site visits and classes.

Are you interested in gaining knowledge and helping others? If yes, the Colorado Master Gardener program is for you! Boulder County has one of the largest Boulder County Master Gardener programs in the state. In addition, classes and workshops are offered for those interested in native plants, insects, vegetable and xeric gardening. Look to our Teamup calendar for current activities.

Events & Opportunities

Let’s Grow Together – Teamup calendar

Colorado Grow & Give

­ Grow & Give – Colorado Master Gardener

PlantTalk Colorado

Planttalk Colorado™ is sponsored by Colorado State University Extension, Denver Botanic Gardens, and the Green Industries of Colorado. Link to Planttalk for information on over 500 horticulture topics from Colorado horticulturists and professionals.

Timely PlantTalk Videos

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Colorado Gardening for Beginners
Fire Blight by Deryn Davidson, Boulder County Extension. Learn the best action to take if your tree has fire blight.
Planting Under Powerlines by Alison O’Connor, Larimer County Extension. Make sure your tree is the right plant for the right space.
Growing Herbs by LuAnn Aiken and Kris of Tagawa Gardens. Colorado is great for growing herbs.

Planttalk Colorado – Espanol

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.