Kidder Mountain is a 1805 feet (550.2 m) monadnock

Monadnock

A monadnock or inselberg is an isolated rock hill, knob, ridge, or small mountain that rises abruptly from a gently sloping or virtually level surrounding plain...

 located in south-central New Hampshire

New Hampshire

New Hampshire is a state in the New England region of the northeastern United States of America. The state was named after the southern English county of Hampshire. It is bordered by Massachusetts to the south, Vermont to the west, Maine and the Atlantic Ocean to the east, and the Canadian...

 within the Wapack Range

Wapack Range

The Wapack Range, sometimes referred to as the Pack Monadnock Range, is a 20-mile range of mountains in south-central New Hampshire and adjacent Massachusetts. The range is considered very scenic and rugged with many bare summits and ledges ranging from 1,800 feet to 2,290 feet. The 22 mile Wapack...

 of mountains. It lies within New Ipswich

New Ipswich, New Hampshire

New Ipswich is a town in Hillsborough County, New Hampshire, United States. The population was 5,099 at the 2010 census. New Ipswich, situated on the Massachusetts border, includes the villages of Bank, Davis, Gibson Four Corners, Highbridge, New Ipswich Center, Smithville, and Wilder, though these...

 and Temple, New Hampshire

Temple, New Hampshire

Temple is a town in Hillsborough County, New Hampshire, United States. The population was 1,366 at the 2010 census.- History :Incorporated in 1768, Temple takes its name from colonial governor John Wentworth's lieutenant governor, John Temple.- Geography :...

 just off the 22 mi (35.4 km) Wapack Trail

Wapack Trail

The Wapack Trail is one of the oldest public, interstate hiking trails in the United States. Opened in 1923, it follows the Wapack Range north-south for , between Mount Watatic in Ashburnham, Massachusetts and North Pack Monadnock mountain in Greenfield, New Hampshire...

 on a 0.9 miles (1.4 km) side trail. Temple Mountain

Temple Mountain

Temple Mountain is a monadnock located in south-central New Hampshire within the Wapack Range of mountains. It lies within Sharon and Temple, New Hampshire; the Wapack Trail traverses the mountain, and the northern face includes the Temple Mountain Reservation, owned by the state...

 is located directly to the north along the Wapack ridgeline; Barrett Mountain

Barrett Mountain

Barrett Mountain is a mountain located in south-central New Hampshire within the Wapack Range of mountains. It lies within the town of New Ipswich and is traversed by the Wapack Trail. Kidder Mountain is located directly to the north along the Wapack ridgeline; New Ipswich Mountain to the south....

 to the south. The summit of the mountain is mostly open and offers expansive views from old pastures.

The east side of the mountain drains into the Souhegan River

Souhegan River

The Souhegan River is a tributary of the Merrimack River in the northeastern United States. long with a drainage area of , it flows north and east through southern New Hampshire to the Merrimack River....

 watershed, thence into the Merrimack River

Merrimack River

The Merrimack River is a river in the northeastern United States. It rises at the confluence of the Pemigewasset and Winnipesaukee rivers in Franklin, New Hampshire, flows southward into Massachusetts, and then flows northeast until it empties into the Atlantic Ocean at Newburyport...

 and Atlantic Ocean

Atlantic Ocean

The Atlantic Ocean is the second-largest of the world's oceanic divisions. With a total area of about , it covers approximately 20% of the Earth's surface and about 26% of its water surface area...

; the west side drains into the Gridley River

Gridley River

The Gridley River is a river located in southern New Hampshire in the United States. It is a tributary of the Contoocook River, part of the Merrimack River watershed. Most of the river's length is within the town of Sharon....

, thence the Contoocook River

Contoocook River

The Contoocook River is a river in New Hampshire. It flows from Pool Pond and Contoocook Lake on the Jaffrey/Rindge border to Penacook , where it empties into the Merrimack River. It is one of only a few rivers in New Hampshire that flow in a predominantly northward direction...

into the Merrimack River.