With a pop-up camper folding to less than half its fully opened size, storing the camper at home is feasible for many owners. It's also the least expensive option. Most fold down to a height lower than an SUV and are not much longer than an SUV. At this size, you can store your pop-camper in the garage or on one side of the driveway. If you have a wide gateway to the backyard, you can also store it in the backyard.
If you live in a rental or apartment, then storing the camper at home may not be an option. In such cases, an RV storage facility may be your best option. Many major urban areas have storage facilities that rent space for RVs and camping trailers including pop-up campers. You can expect to pay a monthly fee at these businesses. To find an RV storage facility near you, contact a local RV retailer or camping store. The sales people will likely know about any local RV storage companies.
Self-storage facilities are most commonly known for their rows of mini garages that you can keep your stuff in for a monthly fee. However, many self-storage facilities also have a limited number of parking spots for people to store their extra cars, boats or trailers. Since the pop-up camper is small, you may find one of these sites suits your needs. Depending on the area, the pricing may or may not differ from local RV storage facilities. However, you may find that a self-storage facility is closer to your home, making it easier to pick up and drop off your camper before and after camping trips.
When not in use, you do want to protect your pop-up camper from damage. By putting a cover specifically made for pop-up campers over the camper or parking it under a roof when not in use, you will help prevent cracks and leaks that can occur from winter storms or heat from the sun.