Objective. There are significant inequities in colorectal cancer (CRC) screening and outcomes. Via literature review, we assessed CRC screening rates for the vulnerable populations served by free clinics. Methods. A systematic review was conducted for publications on CRC screening in free clinics. Outcomes included CRC screening characteristics, population demographics, and limitations. A methodological quality assessment was completed. Results. Out of 63 references, six studies were included, representing 8,844 participants. Black or Hispanic participants were the plurality in all but one study. All participants were uninsured. Median CRC screening rate was 48.4% (range 6.6–78.9%). Screening methods included colonoscopy, fecal occult blood test, flexible sigmoidoscopy, and fecal immunochemical test. Clinics offering only one screening method had a mean screening rate of 7.2% while those with multiple methods had a screening rate of 65.4%. Conclusion. Access to multiple CRC screening modalities correlates with higher screening rates in free clinics. More work is needed to increase CRC screening in free clinics.