Note: At one time, some may have identified this as "North Carbonate." Cronin is named after Mary Cronin, who is reportedly the first woman to have climbed all of Colorado's 14ers, having completed that task in 1934. She was also only the 4th person known to have done so. The current name was approved by the USGS in 2005, so you will find very few maps that acknowledge it.
Cronin Peak is a nickname for UN 13,872, per LIDAR, (formerly UN 13,870/North Carbonate), a Class 2 summit which lies WSW of the 14er - Mt. Antero. This summit is easily accessible by way of its ESE ridge if you have a vehicle capable of making it up FR278 which is the road up Mt. Antero. That tedious road is best tackled with a shorter-bed, higher clearance 4WD vehicle. You can park around 12,700 feet to begin the hike. For those who either want to make the hike more sporting or who don't want to abuse their vehicle on FR278, another alternative is to drive the three miles from the lower, Baldwin Creek trailhead to the FR277/FR278 junction, park and hike the NNE ridge of Cronin, which still has a Class 2 rating, but is rockier. Either way requires a higher clearance vehicle at a minimum. It's also possible to walk from the Baldwin Creek lower TH, but this will add six miles round-trip to the day.