This image was captured on September 30th, 2026 at 18:47 p.m MDT. The clouds have sunlight from the setting sun shining on them, so I assume they are middle to high clouds. The formation is wispy and patchy, and the astmosphere is mostly stable. These characteristics point to these being altocumulus clouds.

Skew-T from University of Wyoming dispalying 00 UTC on October 1st (1800 MDT September 30th) from Grand Junction: