The Common Data Sets show 4, 5 and 6 year grad rates starting in section B4.
Graduating in 4 years is correlated with income level and a school’s level of financial aid. So schools with relatively affluent students and/or those that meet full need tend to have better grad rates. It is more difficult to tease out other reasons for relatively low grad rates, such as not being able to get classes in the proper sequence due to overcrowding, or inadequately staffed departments.
Covid is going to have a huge negative impact on 4 year grad rates for the classes that have been in college during this time. Many students took a gap semester/year during this time period, and this will decrease the proportion of students graduating in 4 years even at LACs, which traditionally have high 4 year grad rates.