Alderfer / Three Sisters Park

Alderfer/Three Sisters rock formations rises above the trees at the park. Photo by Steven Conley.
  1. CLOSED: Forestry Closure Update - FULL WEST SIDE CLOSURE begins 12/11.The west side of the park will be completely closed for forest health mitigation until further notice (~mid-2024, weather dependent). The west trailhead parking lot will remain open for access to the south. Trails impacted by closure: Mountain Muhly Trail, Bearberry Trail, Homestead Trail, Silver Fox Trail, Ponderosa Trail, and the majority of Sisters Trail. 2023 ALD Forestry - Map of the Second Segment Closure (PDF)

    The eastern side of the park and trailhead have reopened following completed forestry work in that area. 

    Be sure to know before you go and sign up for Alerts & Closures to get real-time notices of park and trail closures.

    >> Watch this video to learn how to sign up for Alerts & Closures 

Near the heart of Evergreen, Alderfer/Three Sisters Park has stunning vistas, landmark rock formations, beautiful old stands of ponderosa pine and the most trails per acre of any foothills park.

Alderfer/Three Sisters West Trailhead
5136 South Le Masters Road
Evergreen, CO 80439

Alderfer/Three Sisters East Trailhead
30357 Buffalo Park Road
Evergreen, CO 80439

Map of closure for forestry work in the western portion of Alderfer/Three Sisters Park


Park Regulations

Recreation & Activity Management Guide

Jeffco Non-emergency Number: 303.980.7300

Alderfer/Three Sisters Park 2023-2024
Jefferson County Open Space (JCOS) will be performing forest health work on approximately 240 acres of ponderosa pine and Douglas-fir forests in Alderfer/Three Sisters Park. This work will begin in August 2023 and conclude in Summer 2024. This project was identified in the JCOS Forest Health Plan and will focus on reestablishing a healthy forest while reducing the risk of catastrophic wildfire that could severely impact the natural environment and surrounding structures. It will also contribute to achieving our Conservation Greenprint goal for improving forest health on 1,000 acres of JCOS lands by the year 2025. More information about JCOS forestry.

Alderfer/Three Sisters Park 2021
In 2021, Jeffco Open Space conducted wildfire mitigation and forest restoration in Alderfer/Three Sisters Park. This work removed woody vegetation to a create a fuel break, strengthen emergency access, and improve forest health. This work built on the JCOS forest management along Buffalo Park Road in 2020 and is part of our  Conservation Greenpriont Goal 6 to perform over 1000 acres of forest management by the end of 2025.

In the summer and fall of 2019, Natural Resources staff conducted baseline forest inventories to identify treatment areas and to develop specific management objectives. Staff began removing trees in Spring 2021, and the project was completed in late Winter 2021 Please click the link below for more information.

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