🌤 Weather at Greenfield State Park by season
| Spring | Summer | Fall | Winter |
|---|---|---|---|
| 23–67 °F | 55–80 °F | 30–71 °F | 13–37 °F |
Each range runs from the coldest monthly average low to the warmest monthly average high in that season (1991-2020 climate normals), measured at Weare, 10 mi away, elevation 720 ft. Conditions at the park can differ from the station, especially where elevation differs — check a forecast before you go.
🏕️ New Hampshire’s Monadnock Region Basecamp — 250+ Campsites, Otter Lake Swimming, Loon Watching, and New England’s Best Fall Foliage — Greenfield State Park near Greenfield, New Hampshire with 400 acres, 250+ campsites, Otter Lake swimming beach (camper and day-use), canoeing/kayaking/paddleboarding (rentals available), fishing (bass, perch, pickerel, bluegill), hiking trails, bog ecosystem, loon watching, fall foliage, near Mount Monadnock — Hillsborough County, NH
Greenfield State Park sits in the heart of New Hampshire’s Monadnock Region — wrapped around Otter Lake with one of the largest campgrounds in the state park system. Over 250 campsites spread through a mixed hardwood forest, steps from a clear swimming lake with loons calling at dawn.
This is classic New England camping. Paddle a canoe across Otter Lake, fish for bass and pickerel, explore the bog ecosystem, and — if you time it right — witness some of the most spectacular fall foliage in North America.
What to Do
| Activity | Details |
|---|---|
| Swimming | Sandy beach on Otter Lake — separate camper and day-use beaches. Clear, clean water |
| Paddling | Canoe, kayak, and paddleboard rentals on-site. Non-motorized boating on Otter Lake |
| Fishing | Smallmouth/largemouth bass, yellow perch, chain pickerel, bluegill. Shore and boat fishing |
| Hiking | Multiple trails through forest and to scenic ponds. Hogback Trail loop popular |
| Bog Walk | Unique bog ecosystem — sphagnum moss, pitcher plants, cranberries. Interpretive walk |
| Loon Watching | Common loons nest on Otter Lake — listen for their iconic calls at dawn and dusk |
| Fall Foliage | Peak color late September–early October. Monadnock Region is a premier leaf-peeping destination |
Camping
| Detail | Info |
|---|---|
| Sites | 250+ campsites — one of NH’s largest state park campgrounds |
| Amenities | Showers, restrooms, dump station, playground, park store |
| Reservations | Recommended — popular destination. Book via ReserveAmerica |
| Season | Typically mid-May through mid-October |
Best Time to Visit
| Season | Best For |
|---|---|
| Fall (late Sep–early Oct) | 🍂 Peak foliage — hardwoods blazing red, orange, gold around Otter Lake |
| Summer (Jun–Aug) | Swimming, paddling, full campground operations. Loons on the lake |
| Spring (May) | Campground opens. Bog plants emerging. Quieter, cooler |
Frequently Asked Questions
How big is the campground?
250+ sites — one of the largest in New Hampshire’s state park system. Spread through hardwood forest with access to Otter Lake. Reserve early for peak season and fall foliage weekends.
Can I rent a kayak?
Yes — canoe, kayak, and paddleboard rentals available on-site. Otter Lake is non-motorized only — quiet, clean paddling.
Is Mount Monadnock nearby?
Yes — one of the most-climbed mountains in North America is a short drive from the park. Often combined with a Greenfield camping trip.
Nearby state parks: If you have extra time, Pack Monadnock Mountain is a short drive away, and Miller State Park is a short drive away.
🏕️ New Hampshire’s Lakeside Basecamp
250+ campsites, Otter Lake swimming, loon calls at dawn, and some of the best fall foliage in New England — in the heart of the Monadnock Region.
Wildlife & Nature
Greenfield State Park — 400 acres surrounding Otter Lake in Greenfield — provides camping (252 sites — one of NH’s largest campgrounds) and swimming in a forest setting. The park’s bog trail traverses a rare sphagnum bog with carnivorous sundew plants and pitcher plants. Common loons nest on the lake. Beaver maintain a lodge visible from the bog trail. Moose are occasionally spotted. Painted turtles sun on logs.
Nearby Attractions
Peterborough — 10 miles south — inspired Thornton Wilder’s “Our Town” and has the Peterborough Players (oldest summer theater in the US). Crotched Mountain — 5 miles west — has skiing. Temple Mountain — nearby — has hiking. Mount Monadnock — 20 miles southwest — is the most-climbed mountain in North America.
⛺ Camping at Greenfield State Park: Campgrounds & Cabins
| Campsites | 255 sites — 255 campsites — the largest campground in the NH State Park system. Most sites are wooded; RVs are welcome in sites where they fit, but there are no electrical or water hook-ups. Dump station available for registered campers only. |
|---|---|
| Cabins & Lodging | Family group campsites include 2 Adirondack shelters (open, three-sided lean-tos, not enclosed cabins), currently accommodating up to 10 people at a time. No electricity or hook-ups provided. |
| Pets | Pets are permitted in the campground and must be leashed and attended to at all times; pets are prohibited in day-use and beach areas. |
| Reservations | Book via ReserveAmerica (1-877-647-2757) or nhstateparks.org, up to 11 months in advance; youth groups must call the park directly at least 2 weeks ahead. Check-in 1 pm–8 pm, check-out before 11 am. |
| Special sites | Reopened June 2025 after major renovations (new underground utilities, repaved roads, upgraded bathhouses, new dump station). Max 2 vehicles per site, excluding group sites. Generators may run 9 am–12 pm and 5 pm–8 pm; quiet hours 10 pm–7 am. |
| Season notes | Primitive camping opens mid-April (odd-numbered loop only); full-time operation begins May 1; fall primitive camping from October 12; last camping date October 24. |
Camping questions about Greenfield State Park
Can you camp at Greenfield State Park?
Yes. Greenfield State Park has 255 campsites. 255 campsites — the largest campground in the NH State Park system. Most sites are wooded; RVs are welcome in sites where they fit, but there are no electrical or water hook-ups. Dump station available for registered campers only.
How do you reserve a campsite at Greenfield State Park?
Book via ReserveAmerica (1-877-647-2757) or nhstateparks.org, up to 11 months in advance; youth groups must call the park directly at least 2 weeks ahead. Check-in 1 pm–8 pm, check-out before 11 am.
Are there cabins at Greenfield State Park?
Family group campsites include 2 Adirondack shelters (open, three-sided lean-tos, not enclosed cabins), currently accommodating up to 10 people at a time. No electricity or hook-ups provided.
Are pets allowed at the Greenfield State Park campground?
Pets are permitted in the campground and must be leashed and attended to at all times; pets are prohibited in day-use and beach areas.
Source: nhstateparks.org (verified July 2026). Details change seasonally — confirm when booking.
🐾 Dogs & Pets at Greenfield State Park
- Pets allowed? statewide rule
- Many NH state parks allow pets year-round, but policies vary by park and some parks prohibit pets entirely.
- Leash rule statewide rule
- Standard or retractable leash not greater than 6 feet required; animals may not be left unattended.
- Beaches & swim areas statewide rule
- Pets are prohibited at beaches and designated swim areas seasonally from May 1 through September 30.
- Cabins & lodging statewide rule
- Pets are permitted at 13 campgrounds (including Bear Brook, Coleman, Greenfield, Lake Francis, Milan, Mollidgewock, Moose Brook, Pawtuckaway, Pillsbury, Sunapee and Umbagog); cabin/yurt rules vary by park — check before booking.
- Statewide exceptions statewide rule
- Monadnock, North Hampton State Beach, Odiorne Point and most of Rhododendron State Park prohibit pets year-round; Crawford Notch, Franconia Notch and Mount Washington allow pets only on hiking trails and designated dog-walk areas.
Are dogs allowed at Greenfield State Park?
Many NH state parks allow pets year-round, but policies vary by park and some parks prohibit pets entirely. Individual parks can post stricter rules — check signage on arrival.
Rules verified July 2026 via nhstateparks.org. More: New Hampshire state parks guide · Dog rules in all 50 states compared
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