Cape Cod & The Islands

Armstrong-Kelley Park


8.5 acres

Courtesy Above Summit

At 8.5 acres, this garden and woodland oasis is Cape Cod's oldest and largest privately owned public park, with 90+ years of history, rare trees, shady trails, and flourishing gardens.


Plan Your Visit
  • Overview
  • Ideas for Your Visit
  • Admission & Hours
  • Directions & Contact Info
  • What You'll Find
  • Property Map
  • Regulations & Advisories


Armstrong-Kelley Park is an 8.5 acre garden and woodland oasis in Osterville, Massachusetts. In Spring 2020, The Cape Cod Horticultural Society (CCHS), which has owned and maintained Armstrong-Kelley Park for nearly 100 years, approved a plan to be integrated into The Trustees. Through this integration, which became official in the Fall of 2021, this treasured community resource is now a Trustees reservation, and its 12th public garden.

Ideas for Your Visit

Enjoy seven trails through the woodland, spot more than two dozen rare species of trees and hundreds of rhododendron and azalea plants, and enjoy the John Folk Water garden complete with sculptures and fish pond. Picnic tables and benches are scattered throughout.

Admission & Hours

Free admission, open from sunrise to sunset, year-round

Directions & Contact Info

675 Main Street
Osterville, MA 02655

Get directions on Google Maps

From points north: Follow I-93 S, MA-3 S and US-6 E to MA-149 S in Barnstable. Take exit 65 from US-6 E. Follow Osterville West Barnstable Road and Main Street to your destination.

From points west: Take I-90 E/Massachusetts Turnpike, I-495 S, MA-25 E and US-6 E to MA-149 S in Barnstable. Take exit 65 from US-6 E. Follow Osterville West Barnstable Rd and Main St to your destination

What You'll Find

The 8.5 acre parcel is home to a variety of plantings, as well as trails and shady walkways. During your visit you can find:

  • Dozens of rare and unusual trees, including a Franklinia specimen
  • 250 rhododendron and azalea plants
  • A holly dell containing many varieties
  • The John Folk Water garden, sculpture and fish pond
  • Seven hillside trails
  • Liam’s train
  • A certified wetland
  • Picnic tables for gatherings

Property Map

A property map will be posted once restoration/expansion construction is complete.

Regulations & Advisories

  • Dogs are welcome, on-leash only.
  • The Trustees reserves the right to photograph or video visitors and program participants for promotional use, and usage of our properties implies consent. Please read our photo and video policy.
  • A campaign is underway to raise $2.25 million for restoration and expansion of the gardens, and improvements in parking and circulation, as well as ongoing community programming, property stewardship, and horticultural staffing. The Trustees has invited Mikyoung Kim Design to create a preliminary vision plan for the park, with input garnered from listening sessions with the CCHS Board, neighbors, and other community members. This new vision for the park is grounded on beloved elements like the main green and Liam’s Train, and extends horticultural interest with new specimen trees, garden rooms, and plant collections.
  • Construction on the driveway, accessible paths, and main green are expected to begin in Spring 2022. Click here to view a conceptual rendering, courtesy of Mikyoung Kim Design.
Before Setting Out
More to Explore

Enhancement & revitalization

A campaign is underway to raise $2.25 million for garden restoration and expansion, improvements in parking and circulation, and ongoing community programming, stewardship and staffing.
Learn more or give
Upcoming Events

Armstrong-Kelley Park History

The Cape Cod Horticultural Society (CCHS) was founded February 17, 1928 with 78 charter members, most of whom were professional gardeners. In 1930, two sisters, Mrs. Marion (Seaverns Williams) Kelley and Mrs. Mary Martha (Armstrong) McClarey gave 8.5 acres of land near their home, Bandeley Manor, to the CCHS. For 90+ years dedicated volunteers cared for the land, which became Armstrong-Kelley Park.

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