2019: two-year-old season

Earthlight was ridden in all of his races as a two-year-old by Mickael Barzalona. On his racecourse debut the colt was made the 1.1/1 favourite for a maiden race over 1100 metres at Maisons-Laffitte Racecourse on 19 June and won by a neck from Dutch Chop with a gap of four and a half lengths back to the other eight runners.^[5] Two weeks later at Deauville Racecourse he started odds-on favourite for the five-runner Prix de Caen over 1200 metres. After settling in third place he went to the front 200 metres from the finish and drew away in the closing stages to win in "comfortable" style by three and a half lengths.^[6] On 28 July, over the same course and distance, Earthlight was stepped up in class for the Group 3 Prix de Cabourg and started 1.3/1 favourite against four opponents. He raced in fourth place before moving up to take the lead 200 metres out and won "readily" by four lengths from Well of Wisdom.^[7]

On 18 August at Deauville Earthlight started 2.4/1 second choice in the betting behind the filly Raffle Prize (winner of the Queen Mary Stakes and the Duchess of Cambridge Stakes) in the Group 1 Prix Morny. The other six runners included A'Ali (Norfolk Stakes, Prix Robert Papin), Arizona (Coventry Stakes), and Golden Horde (Richmond Stakes). After racing in mid-division as Raffle Prize set the pace, Earthlight moved up to challenge the favourite, gained the advantage in the last 200 metres and won by a neck.^[8] After the race André Fabre said that the colt would stay further and would probably be aimed at the 2000 Guineas.^[9]

On 28 September, Earthlight was sent to England to contest the Miiddle Park Stakes over six furlongs at Newmarket Racecourse and started the 11/4 favourite. His eight opponents included Mums Tipple (an eleven-length winner of his last race), Siskin (Phoenix Stakes), Threat (Champagne Stakes), Monarch of Egypt (runner-up in the Phoenix Stakes), Lope Y Fernandez (Round Tower Stakes) and Golden Horde. Siskin was withdrawn from the race after becoming unruly in the starting stalls. Earthlight started quickly but then settled in mid-division before making a sustained run in the last quarter mile. He got the better of Golden Horde inside the final furlong and won by a neck with third and fourth places going to the outsiders Summer Sands and King Neptune.^[10]

In the official rating of European two-year-olds for 2019 Earthlight was rated the second-best juvenile of the year, level with Kameko but ten pounds inferior to Pinatubo.^[11]

2020: three-year-old season

Earthlight was expected to begin his second campaign in the Prix de Fontainebleau at Longchamp on 11 May, the day on which racing resumed in France after the COVID-19 outbreak lockdown. On 6 May however it was announced that the colt would miss the race after sustaining a sprained fetlock in training.^[12] The colt made a belated seasonal debut in the Listed Prix Kistena over 1200 metres at Deauville on 12 July and started the 2/5 favourite against seven opponents. He took the lead 400 metres from the finish and drew away to win by two and a half lengths from Wanaway.^[13] Four weeks later the colt started favouritre for the Group 1 Prix Maurice de Gheest over 1300 metres at the same track. He was in contention from the start and disputed the lead in the closing stages but was outpaced in the closing stages and sustained his first defeat as he came home fourth behind Space Blues, Hello Youmzain and Lope Y Fernadez, beaten a length by the winner.^[14] On 13 September Earthlight was dropped back to Group 3 class for the Prix du Pin over 1400 metres at Longchamp Racecourse. Starting the odds on favourite he raced in mid-division before taking the lead 100 metres from the finish and winning "a shade cosily" by three quarters of a length from the Prix de la Grotte winner Tropbeau.^[15] On his final racecourse appearance Earthlight started the 1.4/1 favourite for the Group 1 Prix de la Foret over 1400 metres at Longchamp on 4 October. He took the lead after 300 metres and maintained his advantage for most of the way before being overtaken in the closing stages and beaten a neck into second place by the six-year-old mare One Master.^[16]

Nine days after his run in the Prix de la Foret it was announced that Earthlight had been retired from racing and would start his stud career at the Kildangan Stud in 2021.^[17]