Ashton's Saracens contract was rumoured to be worth £250,000 per season.
On 1 September 2012, he made his Saracens début against London Irish.
He scored two tries on his début, in a game which Saracens won 40–3.

Saracens finished the 2012–13 regular season at the top of the table, 3 points ahead of Leicester Tigers.
However, in the play-offs they lost their semi-final match against Northampton, Ashton's former club, by 13 points to 27.
Ashton scored a total of 6 tries that season.

In the 2013–14 season, Saracens again finished the regular season as league leaders, 9 points clear of Northampton.
They then won their semi-final against Harlequins, including a try from Ashton in the 61st minute.
However, in a hard-fought final at Twickenham they again lost to Northampton, by 20 points to 24.
Ashton finished the season joint-4th in the try scoring table, with a total of 8 tries.

In the 2014–15 Premiership season, Saracens qualified for the play-offs in 4th place, with the same number of points as Exeter Chiefs (68), but taking the 4th spot on account of losing one less game than Exeter.
In the semi-final Saracens again came up against Northampton, with the added disadvantage of playing away at Franklin's Gardens.
However Saracens produced a strong defensive performance, with fly-half Owen Farrell producing an impressive kicking display, which saw Saracens win 29 points to 24.
Ashton was on the replacements' bench.

In the final at Twickenham, Saracens played Bath, who had a strong set of backs, all of whom were England internationals, and were expected to be tough opponents.
However, Bath's challenge faltered as Saracens established early control of the game and did not lose the lead, eventually winning 28-16.
Ashton came on as a substitute in the 60th minute.

Ashton's strong performances throughout the season meant he finished in joint-2nd place on the try scoring tables with 13 tries, the same as fellow Saracens winger Chris Wyles, behind Exeter Chiefs forward Thomas Waldrom.
Ashton's impressive form led to him being called back up to the England training squad for the 2015 Rugby World Cup, which was held in England throughout September–October, although he was not selected in the final 31-man squad for the tournament.

Ashton received a 10-week ban in 2016 for eye-gouging; an appeal against the ban was dismissed.
In September 2016 Ashton received a 13-week ban for biting Saints'Alex Waller in a premiership match on 17 September.
He was free to play again on 19 December.
Ashton's Saracens contract was rumoured to be worth £250,000 per season. On 1 September 2012, he made his Saracens début against London Irish. He scored two tries on his début, in a game which Saracens won 40–3.
Saracens finished the 2012–13 regular season at the top of the table, 3 points ahead of Leicester Tigers. However, in the play-offs they lost their semi-final match against Northampton, Ashton's former club, by 13 points to 27. Ashton scored a total of 6 tries that season.
In the 2013–14 season, Saracens again finished the regular season as league leaders, 9 points clear of Northampton. They then won their semi-final against Harlequins, including a try from Ashton in the 61st minute. However, in a hard-fought final at Twickenham they again lost to Northampton, by 20 points to 24. Ashton finished the season joint-4th in the try scoring table, with a total of 8 tries.
In the 2014–15 Premiership season, Saracens qualified for the play-offs in 4th place, with the same number of points as Exeter Chiefs (68), but taking the 4th spot on account of losing one less game than Exeter. In the semi-final Saracens again came up against Northampton, with the added disadvantage of playing away at Franklin's Gardens. However Saracens produced a strong defensive performance, with fly-half Owen Farrell producing an impressive kicking display, which saw Saracens win 29 points to 24. Ashton was on the replacements' bench.
In the final at Twickenham, Saracens played Bath, who had a strong set of backs, all of whom were England internationals, and were expected to be tough opponents. However, Bath's challenge faltered as Saracens established early control of the game and did not lose the lead, eventually winning 28-16. Ashton came on as a substitute in the 60th minute.
Ashton's strong performances throughout the season meant he finished in joint-2nd place on the try scoring tables with 13 tries, the same as fellow Saracens winger Chris Wyles, behind Exeter Chiefs forward Thomas Waldrom. Ashton's impressive form led to him being called back up to the England training squad for the 2015 Rugby World Cup, which was held in England throughout September–October, although he was not selected in the final 31-man squad for the tournament.
Ashton received a 10-week ban in 2016 for eye-gouging; an appeal against the ban was dismissed. In September 2016 Ashton received a 13-week ban for biting Saints'Alex Waller in a premiership match on 17 September. He was free to play again on 19 December.
Chris Ashton