Last summer I rented an outdoor parking place at a self-storage place in Colorado Springs for my car and bike trailer.
https://www.smartspaceselfstorage.ne...y-road/reviews
There are a number of other self-storage places in town, but this one had space and the price was reasonable. It's on the east side of the city on your way into town on US 24.
I think it has changed ownership since then, but it worked well for me. The parkings spaces were pull-through, so there was plenty of room for my car and trailer. Also, the parking area was completely surrounded by storage buildings, so it wasn't visible from the road.
One thing to watch for. They pro-rate the cost for the first month (if you start on the 15th you only pay half a month), but if you stay even one day into the next month you pay for an entire month. I think that is pretty standard in the business.
Ken