Merrill Lake Campground
Mountain top lake campground
Incredible, free, private. Tent sites only, short hike in from parking lot, bring your own everything. Pit toilets, lake access, close to Mt. St. Helens activities. Four miles from Cougar.
Beaver Bay Campground near Mount St. Helens offers spacious tent and RV sites where pets are welcome. Lone Fir Resort provides pet-friendly accommodations including tent sites, RV spots with full hookups, and cabins for those wanting more comfort while traveling with their dogs. Cougar RV Park and Campground also accommodates pets at their tent sites, RV spaces, and cabin rentals. Sites at Beaver Bay are particularly large, with ample room for families and their pets to spread out under shaded areas with vine maples providing natural privacy between campsites. The campground's proximity to Yale Lake creates opportunities for pets and owners to enjoy shoreline activities, though pets should be kept on leash near water areas.
Hiking trails around Mount St. Helens offer excellent pet exercise opportunities, with Ape Cave, Trail of Two Forests, and Lava Canyon all within a 10-minute drive from Cougar. Battle Ground Lake State Park Campground maintains pet-friendly policies across their tent, RV, and cabin accommodations. Water access is plentiful for pets needing cooling off, with Yale Lake providing swimming opportunities during warmer months, though the water can be quite cold. The small town of Cougar has two gas stations with mini-markets for basic pet supplies, and campground hosts at locations like Beaver Bay maintain exceptionally clean facilities. For RV campers, Lone Fir Resort offers the added convenience of a restaurant that will deliver food directly to your campsite while accommodating pets, making it an excellent base camp for exploring the area's outdoor attractions.
$5 - $21 / night
"Beaver Bay Campground is a well-run private campground in Washington about 45 mintues east of I-5."
"Right next to Beaver Bay and about a 10-15 minute drive from the Lava Flows and Mt. St. Helen's, we totally lucked out finding a spot here."
"Pros: Good lake to swim in, smaller state park so not too busy, kayaks you can rent, small playground if you have kids, pet frIendly cabIn I stayed In was faIrly secluded Cons: because it’s smaller, kids"
"Site staff on hand if needed but honestly the primitive sites are exactly what you are looking for: remote, spacious, quiet, fire and pet friendly and great views."
$20 / night
"Tucked right on the banks of the East Fork of the Lewis River and on the edge of the Gifford Pinchot National Forest, this is a great get away for anyone in the Vancouver / Portland area."
"11 is a walk I’m site that offers the most seclusion in the campground. You are away from all other campers and surrounded by river and trees."
"Easy access to Mt. St. Hellens, Ape cave and Yale lake. Very beautiful area!"
"The best things about Lone Fir Resort are the location and the restaurant. "
"Pit toilets, lake access, close to Mt. St. Helens activities. Four miles from Cougar."
"There are 8 walk in sites and one drive up site, all first come first serve discovery pass required. Some sites are larger than others, but in ours we were able to fit two 6ptents and one 2p tent."
$23 / night
"Short trailed from the campsite, very close to the Mt. St Helens trails! Very nice area, we will be back!!"
"There are several awesome trails you can take right from the campground and there is a campground trail that guides you around the whole campground area."
"Nearest store was about 45 minutes away in Cougar. Downers: It was hot! We visited during a heat wave and it got very hot, especially in the direct sunlight. Made the tent a little unbearable. "
"It has access to Swift Reservoir and has a boat ramp as well as a swimming area. The roads are paved and perfect for the kids to ride bikes and scooters around camp."
"I was pleasantly surprised when I arrived to see only one other person camping nearby. I was able to find a spot next to a couple others. One was kind of hidden back behind the main spot."
"Found this campsite when driving up to the south side of Mount St. Helens Hikes - it is situated between Ape Caves (farther away) and pretty close to Lava Canyon and Ape Canyon."
$20 - $40 / night
"Our campsite (#6) was right next to the trailhead down to lower falls and the bathrooms so it was not the most private but we never thought it was an issue."
"This campground is located along what is possibly the best waterfalls in Washington state."
$25 - $125 / night
"Cougar is a relaxed campground worthwhile as a base camp for the south side of Mt St Helens and its great lava tubes and forest hikes, so we ended up staying a second night as it had good hot showers,"
"We happened to be tucked away in a corner closer to the road (which didnt bother us at all). No real bathrooms close to us, just portables which were very clean so again no problem for us!"












Incredible, free, private. Tent sites only, short hike in from parking lot, bring your own everything. Pit toilets, lake access, close to Mt. St. Helens activities. Four miles from Cougar.
This site is amazing people have already set things up for tent camping. There is space for RV but I recommend your really good with it. Has a fire pit with rocks. Plenty of firewood in woods. If you look hard enough you can find a PRIMITIVE toilet (plywood stand with toilet seat). The area has enough space for group campers. We did also see elk in area coming from south on NF 9038 from Cougar there were other sites we picked this one. Have fun please keep it clean and leave it the way you left it or better for others!
Nice RV park, close enough to Portland to work for us. We don’t have a tow car so we relied on public transportation to get to downtown, which was great (though it is a 1 mile walk to the bus stop). There are many long-termers here, but due to their 10 or 15 year RV rule, all the RVs here were really nice and fancy. There’s a little area with a free table, a book exchange, some workout equipment, a kitchen, laundry, and showers. The laundry room had a designated pet washer and dryer, which I always love, so we washed all of our dog bedding here. Showers were really really nice, super hot, good pressure, clean, free. Staff was nice as well. Free wifi that worked pretty well. There’s a small neighborhood dog park right across the street.
The Mayfield Lake is the main attraction. Be sure to visit the day use area across the road for lake access with swimming, picnic, and a dog park on the water.
Very good privacy for the standard campsite loop. Standard campsites are either pull through or back in.
There's a trail around the edge of the lake in campsite loop. Find the point, you wont be disappointed.
Most of the time we have the dog park to ourselves 😍
Absolutely love the cabins at this place! We live 30 minutes away so it’s the perfect quick get away. Our dog LOVES the dog park too. Amazing views
We stayed here for about 5 days while we tested out our new trailer prior to a longer cross country trip. We are from Portland and this is a short drive from home.
Sites here are spacious and have picnic tables and firepits. We had room for our 28 foot trailer plus 2 pickups (extra charge for extra vehicle though).
Shower facilities were ok - typical campground facilities in my opinion, but at least it was an actual toilet and hot water in the showers.
Not a ton of privacy at each site, but got some shade during each day and plenty of space to stretch out and cook/eat outside or just sit and chill.
There are miles of hiking trails that are family friendly and the dog park has one of the best views I've ever seen from a dog park.
The camp host we met was super friendly and very helpful. They sell firewood and ice every evening.
This park has breathtaking views and a nice dog park. Most of the time I have the place to myself
We've been here longterm since July 2020 and have had a great experience. It's definitely costs more to stay here but we've found the location to be exceptional being close to most things but rural and quiet. It's conveniently close to the fairgrounds so lots of places to walk the dogs etc. They do tout that they are a "resort" but really no amenities to live up to that. They have a nice laundry facility and showers but no dog park (just an area designated to let them do their "business") but no pool, picnic area, etc. They have had on site management here at times but it's very sporadic, but the people they have had when here are very helpful and friendly. I did have a water leak that I reported both using their online report and followed up with a phone call which apparently went unnoticed or unheeded. I only know this because it was mentioned by someone who came by to record our water usage seemed surprised by the leak. (Hey, I did all I could do!) Overall this is a clean and well kept safe location that I would recommend to anyone traveling through, especially with large RV's and although expensive it's been perfect for our longterm situation. Just don't expect a "resort".
The Cougar, Washington camping area sits within the Gifford Pinchot National Forest at an elevation around 1,700 feet, offering access to volcanic landscapes formed by Mount St. Helens. Seasonal temperature variations can be significant, with summer highs in the 80s and winter lows frequently below freezing. Campers should plan for limited cell service throughout the region, with connectivity often unavailable within a 13-mile radius of remote campgrounds.
Waterfall exploration: 4 miles away from town, Lower Falls Campground provides direct access to multiple cascades. "The falls are stunning - pictures really don't do it justice. We were also pleasantly surprised there were zero bugs or animals scavenging for food," reports Blaine B.
Swimming in cold mountain waters: Yale Lake offers swimming opportunities, while the Lewis River provides refreshing spots during summer months. At Swift Forest Camp, "There is a large covered picnic area near the lake, a marked swimming area (if you like freezing cold water) and a boat ramp. Life jackets are available," notes Stephanie Z.
Non-motorized boating: Several lakes prohibit motorized crafts. As one visitor to Merrill Lake Campground explains, "You can't use motorized boats and can only fly fish in the lake, but a very nice 1 mile hike is adjacent to the day use area. Also very close to Cougar for gas and supplies for emergencies."
Quiet weekday camping: For those seeking solitude, timing matters significantly. "We stayed in an rv spot with our trailer. They are very strict about quiet hours. There is a pool, gameroom, restaurant and store. Easy access to Mt. St. Hellens, Ape cave and Yale lake," notes Michael K. about Lone Fir Resort.
Fall camping season: The area remains accessible during autumn with fewer crowds. "We had the WHOLE campground to ourselves. Last weekend available for camping here for the year. First come and free! Were right on the lake. Big campground nestled in the trees. Certainly quiet," reports Chris J. about Swift Forest Camp.
Horse-friendly trails: For equestrians, dedicated facilities exist nearby. "Kalama Horse Camp has always been one of my favorite places to take my horses for a camping adventure. There are several awesome trails you can take right from the campground and there is a campground trail that guides you around the whole campground area," explains Kelcie T.
Limited services: Many campgrounds lack utilities. At Sunset Falls Campground, "There is no electricity or dump station. The Upper loop has a hand-pump well for water. Multiple outhouses are around the sites," advises Joe C.
Tent-only options: Several locations accommodate only tent camping. "There are 8 walk in sites and one drive up site, all first come first serve discovery pass required. Some sites are larger than others, but in ours we were able to fit two 6p tents and one 2p tent," notes Brooke S. about Merrill Lake Campground.
Weather preparedness: Conditions change rapidly regardless of season. "We decided to go camping during a terrible storm the site was still great! There's also zero service, just FYI," warns Kaydee about Lower Falls Campground.
Dog-friendly campgrounds near Cougar: Most locations welcome pets but have specific rules. "This makes a nice weekend or day trip from Portland. They have a cool volcanic lake with a swimming area and great fishing. Its like a mini crater lake. I mean mini like pond size," explains Ashley Y. about Battle Ground Lake State Park Campground.
Playground access: Some facilities offer play areas. "We have been camping here each summer since I was a kid and now I bring my kids to camp here! There's fishing, swimming, a playground, showers and great camp sites!" shares DawnMarie T.
Private campsite selection: For families needing space from neighbors, research specific site numbers. "11 is a walk-in site that offers the most seclusion in the campground. You are away from all other campers and surrounded by river and trees," advises Josh W. about Sunset Falls Campground.
Dump station locations: Not all campgrounds offer full sanitation services. "This campground is an amazing dry campground, extremely clean, great clean bathrooms, easy access to the reservoir to swim. With an RV dump and potable water," reports Cherie C. about Swift Forest Camp.
Restaurant delivery option: Unique to this area, some campgrounds provide food delivery. "Tiny little town gem. Super clean and nice full hookups including cable. Laundry pool table video games swimming pool full bar restaurant that will deliver to your campsite!" shares Bill T. about Lone Fir Resort.
Length restrictions: Some access roads and sites limit larger vehicles. "Got our 25' tow behind in here just fine. Lovely campground that could use some better maintenance… saw toilet paper hanging from trees, and trash along the river," notes Beth L. about Sunset Falls.
Frequently Asked Questions
Which is the most popular dog-friendly campsite near Cougar, WA?
According to TheDyrt.com, the most popular dog-friendly campground near Cougar, WA is Beaver Bay Campground with a 4.5-star rating from 15 reviews.
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