Box-style automatic milking systems (AMS) have increased in popularity over the last decade in the US. It is estimated that in the Upper Midwest (including Iowa, Minnesota, Michigan, and Wisconsin) alone there are over 400 systems in place. The objective of this study was to describe the main production parameters collected by the AMS software. We used 1 yr of retrospective daily data (summer 2017- summer 2018) from 36 free-flow AMS (Lely Astronaut, Lely, the Netherlands) farms (13,050 farm days) in Minnesota and Wisconsin for the analysis. The MEANS procedure of SAS 9.4 (SAS Institute, Inc., Cary, NC) was used to analyze the data. The average number of robots/farm was 2.8 (±1.6). The average number of cows/robot was 57.6 (±5.4). Cows were on average 47.0 (±4.9) mo old and DIM averaged 171.0 (±25.5). Daily milk production/cow was 37.3 (±4.3) kg and daily milk production/robot was 2,153.0 (±350.6) kg. A previous study conducted by our group found average daily milk production of 33.2 (±5.3) kg/cow and 1,861.1 (±380.4) kg/robot using AMS data from 2013 and 2014. It seems there has been a numeric milk production increase in AMS farms over recent years. Farms averaged 2.8 (±0.2) successful milkings/cow/d and 1.15 (±0.5) refusals/cow/d. The median number of failures per robot/d was 5.4 (±3.5). Refusals are an indication that cows are voluntarily visiting the AMS frequently. Failures should ideally be close to 0. It has been suggested by the manufacturers that there should be less than 5 failures/robot/d. Milking speed in this study was 3.07 (±0.4) L/min and milking time was 5.4 (±0.5) min. Cows with greater milking speed spend less time milking, which could allow a higher number of cows per AMS. The same parameter may also be used to decide whether cows should be culled or not. The amount of concentrate/100 kg of milk was 15.0 (±2.8) kg and concentrate offered/cow/d was on average 5.5 (±0.9) kg. Average rest feed was 0.3 (±0.14) kg. This study provides a more recent overview of AMS farm metrics in the Midwest US.