Find 43 four-bedroom apartments for rent in Boulder, CO. A four-bedroom apartment is a unit with four distinct bedrooms that share a common area and kitchen. Depending on the floor plan, each room may share or have its own bathroom. If roommates split the cost of a four-bedroom rental, it can be a very affordable option. Additionally, units with more bedrooms typically offer a larger living space, allowing renters to make room for shared furniture or host guests. Finding cost-effective living options in Boulder, CO is made easier with 43 apartments for rent under $3,000. These budget-friendly rental options offer a variety of floor plans and amenities while adhering to your financial preferences. Opting for an apartment under $3,000 in Boulder means enjoying a balanced lifestyle where price does not compromise the quality of living.