1981: two-year-old season

Mountain Lodge made her racecourse debut in a 27-runner maiden race over six furlongs at Newmarket Racecourse in October and finished unplaced behind Merlin's Charm. In their annual Racehorses of 1981, the independent Timeform organisation described her as a filly who was likely to improve given "a good test of stamina".^[6]

1982: three-year-old season

On her first two races as a three-year-old Mountain Lodge finished third and second before winning a maiden race over two miles at Nottingham Racecourse. She then "trotted up" in a minor race over the same distance at Thirsk Racecourse. She was unplaced on her next start but then won a handicap race over two and a quarter miles at Ayr Racecourse by a neck from the colt Dudley Wood. In October the filly started at odds of 9/1 in a 28-runner field for the Cesarewitch Handicap over two and a quarter miles at Newmarket.^[7] Ridden by Willie Carson, and carrying a weight of 108 pounds, she won by three lengths from the seven-year-old gelding Popsi's Joy who had won the race in 1980.^[8] At the end of the year he was given a rating of 97 by Timeform, 37 behind their top stayer Ardross and 34 pounds behind their best three-year-old filly Akiyda.^[9]

1983: four-year-old season

Mountain Lodge was kept in training as a four-year-old with the Ascot Gold Cup in June as her principal objective. She missed a scheduled run in the Sagaro Stakes when the race meeting was abandoned due to waterlogging and made her seasonal debut in the Henry II Stakes at Sandown Park in May when she finished fourth to Ore. Her Gold Cup hopes were ended when she sustained a foot injury on the day of the race and had to be withdrawn. Later that month she contested the Northumberland Plate at Newcastle Racecourse but raced poorly and finished unplaced behind Weavers' Pin.^[2]

After a break of well over two months Mountain Lodge returned in the Doncaster Cup in September and came from well off the pace to finish third behind Karadar and Gildoran. The 1983 Irish St Leger, run over one and three quarter miles at the Curragh Racecourse on 8 October, was the first edition of the race to be open to older horses instead of being restricted to three-year-olds. Heavy rain in the build-up resulted in very soft ground and conditions were not improved by a thick mist which restricted visibility. The British colt Band (winner of the Cumberland Lodge Stakes) started favourite ahead of Colonial Flag (representing the Vincent O'Brien stable) and Yawa (Grand Prix de Paris) with Mountain Lodge, who was expected to relish the testing conditions, next in the betting on 13/2. The best of the other six runners appeared to be the British four-year-old Khairpour, who had finished ahead of Mountain Lodge at Sandown and later won the Geoffrey Freer Stakes. Little of the early stages were clearly visible but High Cannon appeared to make the running before Arctic Lord led the field into the straight. Band went to the front in the traight, but Mountain Lodge, ridden by Declan Gillespie, wore down the tiring favourite in the final furlong and won going away by two lengths.^[2]

On her only subsequent start Mountain Lodge was sent to France for the Prix Royal-Oak at Longchamp Racecourse on 30 October. She appeared unsuited by the firm ground and finished ninth behind Old Country.

At the end of 1983 Mountain Lodge was rated 120 by Timeform, seven pounds behind their best stayer Little Wolf.^[2]