Legislative policies that criminalize immigrants have a "chilling effect" on public program participation among eligible immigrants. However, little is known about the effect of local enforcement actions by Immigration and Customs Enforcement (ICE). In this study, we linked county-level data on the number of detainer requests (or immigration holds) issued by ICE to individual-level data from the 2011, 2016, and 2019 American Community Surveys. We fit adjusted logistic regression models to assess the association between detainer requests and enrollment in Medicaid and the Supplemental Nutrition Assistance Program (SNAP) among those likely eligible for each program in US-born versus immigrant households. A higher volume of detainer requests was associated with lower enrollment in both Medicaid and SNAP, particularly among adults in households with at least one immigrant relative to US-born households. We observed the most pronounced effects in 2011 and 2019.