The Keyhole and Longs Peak Trail is a 13.6 mile moderately trafficked out and back trail located near Allenspark, CO that features beautiful wild flowers and is rated as difficult. The trail is primarily used for hiking, walking, nature trips, birding, and horses and is accessible from March until November. Horses are also able to use this trail.
A good hike on Longs Peak for those not interested in the technical terrain The trail is well labeled and easy to find due to the traffic it receives. Follow the Longs Peak trail. There are many signs that will help you stay on the correct path. There are restrooms available at the trailhead, at 11,000 feet, and in the boulder field on this hike. A nice change over a lot of other back country hikes. This route will not exceed class two hiking. The most difficult part is doing the boulder field, however if you take your time most people can navigate it without trouble. The keyhole is an obvious rock formation seen in the photos I have listed with this hike. The view from it is dramatic. Also take the time to read the plaque on the rock shelter built there.
Snow and ice were on the final ascent and prevented us from reaching the summit as we he'd no technical gear. Will try again next year in August.
I would not make the keyhole a destination hike. If you have hiked all the way to the keyhole, you should put out the extra effort and go all the way to the top of Longs Peak. The view from the keyhole just is not worth all that work. Choose another Longs trailhead hike such as Chasm Lake and have fun going through the Goblin Forest.