Welcome to Jefferson County Extension

Discover... Learn... and Explore with us!


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2015 Colorado Master Gardener Class

Information and application materials are now available here.Classes will start January 21 and run through mid-March.


Tell us about your Extension experience

We'd like to know what you value about CSU Extension in Jefferson County and what you suggest we might change. Click the link above to start this 7 minute survey.


Interested in Farming?

Do you have an interest in farming? Consider applying to attend the Building Farmers program which will be held starting January 20th. Building Farmers Info. Watch for more details soon.


Spotted Wing Drosophila damaging raspberries

Click here for details

Emerald Ash Borer Recommendations for Jeffco

The insect still has not been reported in Jefferson County. Currently recommendations are to treat susceptible ash trees if you live within a 5 mile radius of central Boulder. To help you decide about treatment options, please see the fact sheet "Control Options for Emerald Ash Borer in Colorado" by CSU Extension Entomologist Whitney Cranshaw at this link on the Colorado Department of Agriculture's web site.

Please note that no hardwood tree samples can be brought to the Jefferson County Plant Diagnostic Clinic from Boulder County.

Plant Diagnostic Clinic

Our experts will identify the causes of problems with your plants. For a small fee, we will diagnose insects, diseases and plants at our Jefferson County Plant Diagnostic Clinic.


Jefferson County CSU Extension empowers county citizens and enhances their quality of life through education, innovation and excellence in service.