Located in the Mayacamas Mountains northeast of Kenwood, the park straddles the boundary between Sonoma and Napa counties.

Camping, picnicking, horseback riding, mountain biking, stargazing, fishing and hiking are common attractions of Sugarloaf.

Later, the cholera epidemic dwindled the numbers of the Wappos, who were ultimately relocated to Indian reservations by the American government.

[9] Sugarloaf Ridge State Park's forests consist of Umbellularia (California Bay Laurel), Douglas firs, big-leaf maple, madrone, coastal redwoods, California buckeye and alder trees as well as an abundance of oaks including live, valley, and mixed oaks.

Shrubs of the chaparral include manzanita, chamise, California lilac, coyote bush, toyon, and winebush.

[11] Sugarloaf experiences a colorful spring with a wide array of wildflowers: California poppies, cream cups, lupines, penstemons, buttercups, peas, shooting stars, trilliums, Indian warriors and mariposa lily.

[11] Invasive species include yellow starthistle (Centaurea solstitialis) and Italian thistle (Carduus pycnocephalus).

[12] Deer, along with gray foxes, bobcats, coyotes, black bears, and mountain lions inhabit the park,[13] as well as numerous racoons and an occasional badger.

[14] Trout are present in the streams and are a common attraction for visitors, especially beginning in late spring to early summer.

Upon reaching the summit, Mount Saint Helena, Napa Valley, and a distant view of the Sierra Nevada Mountains can be seen.