Peachtree Valley is part on the King City Grassland Important Bird Area, designated by California Audubon Society. Although entirely in private hands, and thus unprotected, in holds a mix of native and non-native grasslands with a substantial prey base, heaving used by resident and migrant raptors. The grasslands hold impressive breeding numbers of American Kestrel and Loggerhead Shrike. Most local birders visit at least once annually in search of locally scarce winter birds such at Mountain Bluebird and Vesper Sparrow.

This Hotspot has 9 miles of grassland from Highway 158 (milepost 0) northwards. All the land is privately owner, so all birding is from roadside. The road has regular spots to pull-over at entrances to gated ranchland. This road has become popular with motorcycle groups and classic car clubs, and since the highway is straight and the pavement well-maintained, some drivers go much to fast. A driver birding on this road, scanning for birds of interest, needs to pay a lot of attention to the rear-view mirror.

eBird prefers traveling checklist of 5 miles or less for their statistical analyses. The 9 miles in this Hot Spot is quite uniform in habitat, with the only slight variation being the presence of a few large oaks at the south end. If you wished to eBird the entire Hotspot, eBird prefers that you do so in two different lists (say, perhaps. one at 5 miles and the other at 4 miles), or do as many of us do: wait until some interesting bird is seen, start the list then, and go for 5 miles. 

The habitat here is typically dry, barren and arid; often hot in summer but cold in winter.  However, in a few rare years, when there has been a prolonged drought ended by heavy spring rains, there can be spectacular wildflower shows as the barren hillside are painted yellow, orange, white or purple in March and early April.

Raptors can be present in numbers, although higher counts occur in late fall and winter. Residents include Red-tailed Hawk, Northern Harrier, Golden Eagle, Bald Eagle, Barn Owl, American Kestrel, and Prairie Falcon. An occasional California Condor may fly over. Resident grassland birds of interest include Say's Phoebe and Loggerhead Shrike. In fall and winter, these are joined by Ferruginous Hawk (in some winters there are many, other winters are poorer), Mountain Bluebird (numbers vary; most in December-February), flocks of Horned Lark or American Pipit, and many Savannah Sparrow. Vesper Sparrow is scarce but regular from November to February in Savannah flocks. Rarities possible include Rough-legged Hawk and Mountain Plover.

Highway 158 divides Peachtree Road (sometimes spelled Peach Tree Road, sometimes labeled "Airline Highway" on old maps) into two major habitats. In birding lingo, Peachtree Valley is north of Highway 158, to the little hamlet of Lonoak, and this part of Peachtree Road is labelled Highway 25. Little Peachtree Valley is south of Highway 158, until Peachtree Road ends and Indian Valley Road begins. Peachtree Valley is mostly a wide grassland with the San Lorenzo River to the west and barren hills to the east, with only a very few scattered oaks near its south end. Little Peachtree Valley is much more wooded — lovely oak savanna, patches of chaparral, and denser live oak woodlands amongst hills and gorges—at the southern end. All for the property in both Peachtree Valley and Little Peachtree Valley is privately owned, and the only access is the public Peachtree Road.