From Lake Isabella (city) drive north on SR 155 for 7.0 miles to where it turns left in Wofford Heights. Turn left.
Drive 7.7 miles farther to Greenhorn Summit. This is the turnoff point for Sunday Peak, Split Mountain and Black Mountain #5. Continue straight on SR 155.
Drive 5.8 miles farther to a dirt road 24S07 on the right. Turn right.
Drive 2.0 miles to a jeep road on the right. Park near here.
From the parking area (5480'), follow the jeep road east. It soon becomes a use trail.
Follow this use trail 1 1/2 miles to saddle 6480'.
Turn right (south) and ascend cross-country less 1/2 mile to the summit.
Sandy Creek Canyon Road Gate (24S07) off of SR155 is seasonal. Call Greenhorn Ranger District at (760) 379-5646 for road condition and gate closure information.
If you are hiking 24S07, the old jeep road is 0.1 mile past a sharp turn west. If you reach McFarland Creek (gully) you have gone 0.2 mile too far.
Continue on SR 155 to Cedar Creek Campground on the right. Park here.
From the campground (4800'), hike upstream along the canyon for more than 1/4 mile.
After climbing past two waterfalls and then past a large pool above them, begin looking on the west side of the stream for a use trail.
Take the use trail, which zigzags through brush to gain the east ridge of Bohna Peak.
Continue west along this ridge to the summit.
Bohna can be climbed from a trail junction near Sunday Peak. The Sunday Peak Route 2 guide describes this route.
Learn more about Bohna Peak.