Sully Historic Site
Managed by Fairfax County Park Authority
30 acres0.7 mi of trail
Cain Branch Trail
Dog rules not recorded
No trailhead mapped yetWebsite ↗
AOutdoors
Outdoors in Sully Square
9% of Sully Square’s land is conserved, and virtually every resident lives within a half mile of a park
Virtually every resident lives within a half mile of a park. 1.1 miles of mapped trail cross Sully Square, 1.4 per square mile of land. The biggest trail networks: Sully Historic Site (0.7 mi).
Ahead of 94% of U.S. towns. What drives it
Conserved land
9%
47 acres · of 0.8 sq mi of land
Trails
1.1 mi
1.4 per sq mi of land
Park land
50 ac
21 acres per 1,000 residents
Near a park
99%+
of residents within ½ mile
Bike routes
1.1 mi
1.1 mi paths
What kind of outdoors town is Sully Square?
Read from the map. The page puts what stands out first.
Outdoors grade
How much outdoors does Sully Square have?
On conserved land, trails, park land and how close residents live to a park, Sully Square is ahead of 94% of U.S. towns. All four inputs are above most U.S. towns; the share of residents near a park ranks highest, park acres per resident lowest.
A
OutdoorsA character grade: shown, never part of Sully Square’s overall grade.
Conserved land9% of the land · typical VA town 4% · U.S. 4%B+Trails1.4 miles of mapped trail per square mile of land (1 mi) · VA 0.7 · U.S. 0.4APark land21 acres of park per 1,000 residents (50 acres) · VA 8 · U.S. 13B+Parks close to homeVirtually all residents within a half mile of a park · VA 76% · U.S. 72%A+
All U.S. towns we grade (21,298)Ahead of 94%
LessMore
How sure. Graded on any three of the four inputs instead, the letter would range from A− to A+. Trails and many small parks come from OpenStreetMap, mapped by volunteers, so coverage varies from town to town; the half mile is a straight line from each census block, so a river or highway in the way isn’t counted against it.
PAD-US, OpenStreetMap (© OpenStreetMap contributors), Census 2025 Gazetteer and 2020 blocks; details in Sources below. How TownRatings grades the outdoors →
The map
Conserved land, trails & bike routes
Tap a number to zoom to a park. Tap a layer to hide it.
Easements protect land from building but are usually private.© OpenStreetMap contributors · USGS PAD-US
Places to walk
Pick a walk
The longest trail network is Sully Historic Site, with 0.7 miles. Directions go to the nearest trailhead or public parking.
Who protects it
47 conserved acres
9% of Sully Square’s land. Who manages Sully Square’s conserved land, from the USGS Protected Areas Database. Approximate, because parcels can overlap.
County47 ac
Not recorded47 ac
Local Park · 94 ac
The biggest protected parcels
| Parcel (PAD-US) | Managed by | Acres | Public access |
|---|---|---|---|
| Sully Park Local Park | County | 61 | Open |
| Sully Highlands Park Local Park | County | 33 | Open |
Things to do
9 places to go in Sully Square
Beaches, playgrounds, peaks, falls and more. Pick a kind.
Playgrounds in Sully Square
8 playgrounds without a name on the map. Tap “Show all on map” to see them.
Picnic areas in Sully Square
1 picnic area without a name on the map. Tap “Show all on map” to see it.
Trails & water
1 named trail
Named trails
Unpaved · 0.7 mi
Cain Branch Trail0.1 mi
Biking & sports
1.1 miles of bike routes
Bike lanes are often missing from the map in smaller towns, so that number is likely low.
1.1 mi
off-road bike paths
Courts & fields
6Soccer
4Baseball
2Basketball
Includes school and college facilities, which aren’t always open to the public.
When to get out
The best walking months in Sully Square: April and August
NOAA’s 1991–2020 normals for the town and the daylight at its latitude. Outlined months have long days, highs of 59 to 86 °F and little rain for the place.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 9.7 | 10.7 | 11.8 | 13.2 | 14.3 | 14.9 | 14.6 | 13.7 | 12.4 | 11.1 | 10.0 | 9.4 |
| High (°F) | 43 | 46 | 55 | 66 | 75 | 83 | 87 | 86 | 79 | 68 | 56 | 47 |
| Rain (in) | 3.0 | 2.6 | 3.5 | 3.3 | 4.3 | 4.2 | 4.2 | 3.5 | 4.0 | 3.7 | 3.1 | 3.4 |
February is the driest month (2.6 in) and July the warmest (highs of 87 °F). 4.3 inches fall in May, the wettest month. Summer highs reach 87 °F, too hot for the outline. The climate in Sully Square →
Next door
Sully Square and its neighbors
Tap a town to see its outdoors.
| Town | Conserved of land | Trail mi per sq mi | Park acres per 1,000 | Near a park ½ mile | Outdoors |
|---|---|---|---|---|---|
| Sully Square | 9% | 1.4 | 21 | 99%+ | A |
| Chantilly | 21% | 1.1 | 68 | 99%+ | A+ |
| Franklin Farm | 2% | 0.4 | 6 | 99% | B |
| Floris | 16% | 1.2 | 39 | 99%+ | A+ |
The four inputs of the Outdoors grade, from the engine; shares are of land, not water.
Questions about parks and trails in Sully Square
Where can I hike in Sully Square?
The longest trail networks: Sully Historic Site, 0.7 miles; Sully Highlands Park, 0.4 miles. Each one is on the map above, with directions to the nearest trailhead or parking.
How much of Sully Square is conserved land?
9% of its land, against a typical 4% for a Virginia town and 4% nationally (PAD-US). Conserved doesn’t always mean open to visitors: easements are usually private land.
Are dogs allowed on Sully Square’s trails?
Sully Historic Site and Sully Highlands Park don’t have dog rules recorded on the map; check the signs at the trailhead.
Where can I bike in Sully Square?
1.1 miles of bike routes are on the map: 1.1 of off-road paths.
Is there public land near Sully Square?
18,831 acres of parks and open public land lie inside Sully Square or within 10 miles of it (PAD-US), 50 of them inside the town line.
How much outdoors does Sully Square have?
Ahead of 94% of U.S. towns on the Outdoors grade. The grade combines the share of land that is conserved, miles of mapped trail per square mile of land, park acres per 1,000 residents and the share of residents within a half mile of a park. It’s a character grade, so it isn’t part of the overall grade. How it works.
Trail talk
Conditions, parking and favorite walks from Sully Square neighbors.
Share a tip
Sources
Where this page comes from
Conserved and public land: USGS Protected Areas Database of the United States (PAD-US), service updated July 2026. Parks, trails, playgrounds, beaches and other places: OpenStreetMap (© OpenStreetMap contributors, ODbL), map data as of 2026-10-28. Land and water area: Census 2025 Gazetteer. Residents near a park: 2020 Census blocks. National Register: National Park Service. How TownRatings grades the outdoors →