Homes for Sale Under 400K in Boulder CO

Based on information submitted to the MLS GRID as of 2026-06-05 20:33:21 PDT. All data is obtained from various sources and may not have been verified by broker or MLS GRID. Supplied Open House Information is subject to change without notice. All information should be independently reviewed and verified for accuracy. Properties may or may not be listed by the office/agent presenting the information. Some IDX listings have been excluded from this website. [Click here for more information](/mls-disclaimers/#71)

© 2026 REcolorado® All rights reserved. Certain information contained herein is derived from information which is the licensed property of, and copyrighted by, REcolorado®. Some IDX listings have been excluded from this website. [Click here for more information](/mls-disclaimers/#17059)