Welcome to Jefferson County Extension

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Thank you for a successful Fair!

Our 4-H youth held competitions, activities and demonstrations at the Jefferson County Fair August 7-10. Thank you for attending and supporting our youth!

2015 Colorado Master Gardener Class

Classes will start January 21 and run through mid-March. Application materials will be available mid-September 2014. Please call the office at 303-271-6620 to give us your contact information so you can receive the materials as soon as they're available.

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Spotted Wing Drosophila in Jeffco

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Mid Summer Leaf Drop in Progress

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Emerald Ash Borer Found in Boulder

emerald ash borer adult

Emerald Ash Borer (EAB) was found in Boulder, CO, in September 2013. As a non-native insect, EAB lacks predators to keep it in check. EAB only attacks ash trees, and is responsible for the death of millions of ash trees in the midwest.

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.

Flood Resources

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