From Boulder: drive up Boulder Canyon to Nip and Tuck crag. Continue past Nip and Tuck for 0.3 miles to a large RTD parking area/pullout on the left. Park at the far west-end of the parking area. Cross the creek at a 20-mile per hour sign and look for a rock cairn on the south side of the creek. Angle up and right along a lower rock wall to reach the upper (Retirement Rock) wall.
The Classics
Mountain Project's determination of some of the classic, most popular, highest rated routes for Retirement Rock:
Question on the approach: we crossed the creek at the 30 mph sign (not 20, per the description) across from Nursing Home, and came to a clearing with a cairn. However, couldn't see a path and didn't want to crash through the rather thick brush if there is a trail somewhere...I prefer to limit impact on the foliage. Is there a path/trail that I missed, or do you have to bushwhack through?
I'm not sure of the speed limit sign, but you should cross at the far west (up river) end of the parking lot. There used to be a cairn on a big rock on the other side. Then head up a short steep hill, and then angle up stream. The trail grows in and I may need to get there and clip the growth back.