If you find yourself on US-26 at Dixie Summit (the pass), just east of Prairie City, you could activate Dixie Butte, http://www.pnwsota.org/blog/k7atn/2018-november-25/dixie-butte-or-june-2017, with your high clearance vehicle, or you could park your Prius and bushwhack 1.5 miles RT and 550 ft. of elevation gain to 5784.
This was my first time up Barlow Ridge in the summer. Park at the Barlow Pass Sno-Park with a NW Forest Pass. The trail is well-marked, albeit the signs are up high due to this area's popularity during the winter. I encountered quite a few large blow down trees at the start of the hike, so be prepared for some significant tree scrambling.
Summary - the hike to 3977 (from copper creek) is relentlessly steep, easy to follow and ends in a summit with great views. The route on FR 41 from the Sunset Falls campground is festooned with holes and washouts, some of which are spectacularly large.
Summary - Given the two hour drive, a really steep, brush covered cross county hike to the summit, and the need to bring HF along, summiting 4220 is best part of a multi-hill day. A map and compass or GPS is a really good idea, as are trekking poles and long pants.
nOTE THE PEAK NUMBER IS MISTYPED IN THE TITLE - It is Peak 9460.
An easy summit in the John Day area is Long Creek Mountain. To access it turn east off of Highway 395 on NF-3940. This turn is at the Long Creek Summit, 44.6789, -119.1309. The turn off the highway is steep, but I believe it is Priusable to 44.6626, -119.0480. From here it is half a mile and 250 ft. of gain on a rough road to the summit. You can drive it with high clearance and your mirrors folded in, if you don’t mind a few paint scratches.
If you are touring anywhere near Crater Lake National Park, Garwood Butte is a quiet destination for an activation. The forest road is fairly Priusable and the hike is reasonably short, even if a bit steep in places. As for a number of other summits, one reward for making it to the top is a historic fire lookout. The "upper" trailhead is about 1 mile and 600 feet of gain - from Forest Road 3703 (Three Lakes Rd) it's about 2.3 miles and 1000 feet.
From Roseburg, Oregon turn on OR-138 East / Northeast Diamond Lake Boulevard.
Quick update for this semi-popular summit. If you need directions, see WTA... it's very easy to get to.
The road: it's not terrible but I'd recommend a Subaru or better. There are a couple bad spots where high clearence is helpful.
The summit was BUGGY today. I had to wear my rain gear, head net, Deet... was sitting in a massive swarm, sweating. They still managed to bite me. It was hot and muggy, and quite a bit of smoke from the fires in EWA in the air. Views were still very nice despite the smoke.
Summary - Three Corner Rock (TRC) is easy to get to, includes a lovely forest hike with a steady climb, and a open summit with great views. 2M contacts into Portland are easy to make with a half-wave whip. Bring a mast if you want to put a wire in the air as there is only one, eight foot tall, tree to work with. The drive is about 90 minutes from the east side of Portland. The hike climbs about 1100 feet over two miles and is mostly on the well-used PCT.
5774 Entiat Ridge Peak (W7W/CH-197) is a short, steep hike from a trailhead reached out of the Leavenworth area. The summit has expansive views of the area. A high clearance vehicle should be used.
The summit is on the Entiat Ridge that also includes Sugarloaf Peak (W7W/CH-195), 5221 Twin Lead Mtn (W7W/CH-206), and Chumstick Mountain (W7W/CH-196). All four summits can be done in one long day. Two of the three summits (Sugarloaf and Chumstick) are drive-ups, Twin Lead is a drive-up or short hike, and Entiat Ridge Peak is a short hike.