Indoor Fun: Rock climbing walls

Flagstaff has two indoor spots for kids (and adults) to enjoy rocking climbing.
Vertical Relief Climbing Center (205 S San Francisco) is 6000 square feet of dedicated climbing space, staffed with climbing experts, with climbing routes for beginners, kids allt he way up to experts.
Day passes are $16 plus $10 for equipment rental and $8 for a belay lesson, if you need one. Or beginners can get a package that includes all of that for $30.
The whole family can get in on a deal of $20 per climber that includes a day pass and equipment for climbers plus belay instruction for parents. That's only available on Saturdays and Sundays from noon to 3pm.
For more info, call Vertical Relief at 928-556-9909.

3 year old climbing the Aquaplex wall

Another climbing option in Flagstaff, aimed more at beginners, is at the Flagstaff Aquaplex. The climbing wall here is included in the daily admission rate - which is $3 for children, $4 for youth and $5 for adults, a little extra for non-Flagstaff residents. Young children, even just three years old, can climb the wall with supervision, though all official climbing activities are for kids five and up. All climbers must complete a free, Safety Certification course and Climbing Wall Waiver to use the Wall for any scheduled “Open Wall” hours, which can be found HERE. 
There's also a kids climbing club for ages five and up which meets Fridays from 7-8:30pm. Details on that HERE. Additionally, the Aquaplex teaches lessons for kids on everything from proper foot placement to breathing techniques on Mondays from 6-7pm. Details on those HERE.