Oregon recently launched an automatic-enrollment retirement savings program for private sector workers lacking access to other workplace retirement plans. We analyze participation choices, account balances, and inflow/outflow data using administrative records between August 2018 and April 2020. Within the small- to mid-sized firms served by OregonSaves, estimated average after-tax earnings are low ($2,365 per month) and turnover rates are high (38.2% per year). Younger employees and employees in larger firms have been less likely to opt out of the OregonSaves program, but participation rates fall over time. The most common reason given for opting out is “I can’t afford to save at this time,” but the second most common is “I have my own retirement plan.” As of April 2020, 67,731 accounts had positive account balances, holding $51.1 million in total assets. The average balance was $754, but with considerable dispersion; younger workers accumulated the fewest assets due to higher job turnover. Overall, we conclude that OregonSaves has meaningfully increased employee savings by reducing search costs. The 34.3% of workers with positive account balances in April 2020 is comparable to the marginal increase in participation at larger firms in the private sector. Employees opting out of OregonSaves are often doing so for rational reasons.