Monadnock State Park

{{Short description|State park in Cheshire County, New Hampshire}}

{{Use mdy dates|date=August 2023}}

{{Infobox park

| name = Monadnock State Park

| photo = Mount Monadnock from route 124.JPG

| photo_width = 280

| photo_alt =

| photo_caption = Mount Monadnock as seen from NH 124

| type =

| location = 169 Poole Road, Jaffrey
Cheshire County, New Hampshire

| coords = {{coord|42.8625|-72.0675|type:landmark_scale:10000_region:US|format=dms|display=inline,title}}

| elevation = {{convert|1224|ft}}{{cite gnis|1917904|Monadnock State Park}}

| area = {{convert|1017|acre}}

| created =

| administrator = New Hampshire Division of Parks and Recreation

| status =

| website = [https://www.nhstateparks.org/visit/state-parks/monadnock-state-park Monadnock State Park]

}}

Monadnock State Park in Jaffrey, New Hampshire, United States, is a {{convert|1017|acre|km2|adj=on}} state park located on and around {{convert|3165|ft|adj=on}} Mount Monadnock. The park is surrounded by thousands of acres of protected highlands.

The park is open to hiking, picnicking, camping, backpacking, snowshoeing and cross country skiing.{{cite web|title=Best Trails in Monadnock State Park|url=http://www.alltrails.com/parks/us/new-hampshire/monadnock-state-park|publisher=All Trails|accessdate=February 22, 2017}} Backcountry skiing is possible on some of the lower trails. There are two campgrounds.

A per-person fee is charged (in season) to park at the Old Toll Road and State Park Headquarters trailheads.{{cite web|title=Monadnock Trails-Monadnock Mountain |url=http://monadnocktrails.com/|publisher=Monadnock Trails|accessdate=February 22, 2017}} There are no roads to the summit, and the Old Toll Road, which leads to the Halfway House site, is closed to vehicles.

In 1987, Mount Monadnock was designated a National Natural Landmark.