Stimpson Family Nature Reserve
Managed by Whatcom County Parks & Recreation
259 acres2.1 mi of trail
Stimpson Main LoopGeneva Pond Loop
Dog rules not recorded
Directionsto the trail signWebsite ↗
AOutdoors
Outdoors in Sudden Valley
Sudden Valley has 9.2 miles of mapped trails, 2.2 for every square mile of land
17% of Sudden Valley’s land is conserved, about 473 acres. The biggest trail networks: Stimpson Family Nature Reserve (2.1 mi), Lake Louise Natural Resources Conservation Area (1.8 mi), Lookout Mountain Forest Preserve (0.9 mi). 120 acres are parks and preserves, 20 per 1,000 residents.
Ahead of 88% of U.S. towns · #56 of 285 in Washington. What drives it
Conserved land
17%
473 acres · of 4.3 sq mi of land
Trails
9.2 mi
2.2 per sq mi of land
Park land
120 ac
20 acres per 1,000 residents
Near a park
71%
of residents within ½ mile
Lakes & rivers
3
2 boat launches
What kind of outdoors town is Sudden Valley?
Read from the map. The page puts what stands out first.
Outdoors grade
How much outdoors does Sudden Valley have?
On conserved land, trails, park land and how close residents live to a park, Sudden Valley is ahead of 88% of U.S. towns, #56 of 285 in Washington. All four inputs are above most U.S. towns; trail miles rank highest, the share of residents near a park lowest.
A
OutdoorsA character grade: shown, never part of Sudden Valley’s overall grade.
Conserved land17% of the land · typical WA town 4% · U.S. 4%ATrails2.2 miles of mapped trail per square mile of land (9 mi) · WA 0.8 · U.S. 0.4APark land20 acres of park per 1,000 residents (120 acres) · WA 11 · U.S. 13BParks close to home71% of residents within a half mile of a park · WA 92% · U.S. 72%B
All U.S. towns we grade (21,298)Ahead of 88%
LessMore
Washington towns of 2,500+ (285)Ahead of 81%
Water is 30% of Sudden Valley’s area (2 of 6 square miles), so every share here is of land; over land and water together, the conserved share would read 12%.
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 Stimpson Family Nature Reserve, with 2.1 miles. Directions go to the nearest trailhead or public parking.
Lake Louise Natural Resources Conservation Area
Managed by Washington State Department of Natural Resources
135 acres1.8 mi of trail
Stimpson Main Loop
Dog rules not recorded
Directionsto the parking lotWebsite ↗
Lookout Mountain Forest Preserve
Managed by Whatcom County
112 acres0.9 mi of trail
Rufus Creek Trail
Dog rules not recorded
Directionsto the trailheadWebsite ↗
Who protects it
473 conserved acres
17% of Sudden Valley’s land. Water is left out: Sudden Valley has 4.3 square miles of land and 1.8 of water, so the share counts land only. Who manages Sudden Valley’s conserved land, from the USGS Protected Areas Database. Approximate, because parcels can overlap.
Land trusts & nonprofits484 ac
State natural resources135 ac
County112 ac
Regional agency7 ac
Unknown Easement · 266 acPrivate Recreation or Education · 200 acState Conservation Area · 135 acLocal Conservation Area · 112 acPrivate Conservation · 18 ac
Good to know
Conserved doesn’t always mean open to visitors. 3 acres are conservation easements, usually private land. Public access isn’t recorded for 11 of 16 parcels. The walks above are places people visit.
The biggest protected parcels
| Parcel (PAD-US) | Managed by | Acres | Public access |
|---|---|---|---|
| Stimpson Nature Reserce - Lake Louise Private Recreation or Education | Land trusts & nonprofits | 200 | Closed |
| Lake Louise Natural Resources Conservation Area State Conservation Area | State natural resources | 135 | Restricted |
| Lookout Mountain Forest Preserve Local Conservation Area | County | 112 | Open |
| White Deer Private Conservation | Land trusts & nonprofits | 18 | Closed |
| Sudden Valley Dog Park Local Park | Regional agency | 7 | Open |
Things to do
3 places to go in Sudden Valley
Beaches, playgrounds, peaks, falls and more. Pick a kind.
Dog parks in Sudden Valley
Sudden Valley Dog Park
DirectionsBoat launches in Sudden Valley
2 boat launches without a name on the map. Tap “Show all on map” to see them.
Trails & water
8 named trails and 3 lakes & rivers
Named trails
Open to bikes · 0.9 miUnpaved · 6.9 mi
Stimpson Main Loop2.4 mi
Rufus Creek Trail0.8 mi
Area Y Trail0.7 mi
Geneva Pond Loop0.6 mi
Lake Louise Road Trail0.6 mi
Beaver Ridge Trail0.2 mi
Straberry Falls Trail0.2 mi
Strawberry Creek Trail0.1 mi
Lakes & rivers tap for directions
Biking & sports
0.0 miles of bike routes
Bike lanes are often missing from the map in smaller towns, so that number is likely low.
Courts & fields
6Tennis
2Basketball
1Baseball
1Soccer
Includes school and college facilities, which aren’t always open to the public.
When to get out
The best walking months in Sudden Valley: May to September
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) | 8.7 | 10.1 | 11.7 | 13.6 | 15.2 | 16.1 | 15.8 | 14.3 | 12.5 | 10.7 | 9.1 | 8.3 |
| High (°F) | 45 | 48 | 52 | 57 | 64 | 68 | 73 | 74 | 69 | 58 | 49 | 44 |
| Rain (in) | 7.1 | 4.4 | 5.3 | 4.1 | 3.3 | 2.5 | 1.4 | 1.6 | 2.9 | 5.8 | 8.1 | 6.7 |
July is the driest month (1.4 in) and August the warmest (highs of 74 °F). 8.1 inches fall in November, the wettest month. The climate in Sudden Valley →
Next door
Sudden Valley and its neighbors
Sudden Valley has the most mapped trails of the 2 towns around it. 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 |
|---|---|---|---|---|---|
| Sudden Valley | 17% | 2.2 | 20 | 71% | A |
| Geneva | 3% | 1.5 | 12 | 76% | B+ |
The four inputs of the Outdoors grade, from the engine; shares are of land, not water.
Questions about parks and trails in Sudden Valley
Where can I hike in Sudden Valley?
The longest trail networks: Stimpson Family Nature Reserve, 2.1 miles; Lake Louise Natural Resources Conservation Area, 1.8 miles; Lookout Mountain Forest Preserve, 0.9 miles. Each one is on the map above, with directions to the nearest trailhead or parking.
How much of Sudden Valley is conserved land?
17% of its land, against a typical 4% for a Washington town and 4% nationally (PAD-US). Conserved doesn’t always mean open to visitors: easements are usually private land.
Are dogs allowed on Sudden Valley’s trails?
Stimpson Family Nature Reserve and Lake Louise Natural Resources Conservation Area don’t have dog rules recorded on the map; check the signs at the trailhead.
Is there public land near Sudden Valley?
55,467 acres of parks and open public land lie inside Sudden Valley or within 10 miles of it (PAD-US), 171 of them inside the town line.
How much outdoors does Sudden Valley have?
Ahead of 88% of U.S. towns on the Outdoors grade, #56 of 285 in Washington. 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 Sudden Valley 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 →