Kearns coached the Na Piarsaigh club to the Limerick Under-21 Football Championship in 1997, the club's only under-21 county football title. That team included Declan Lynch (Head of Sports Medicine Bath Rugby), Mike Prendergast (Munster Rugby coach), Ian Costello (former Munster Rugby backs coach) and Comdt Joe Mullins, who captained it.
Kearns turned Limerick into the second team in Munster as they outflanked Cork.
Kearns managed the Limerick under-21 team to successive Munster titles and to an appearance in the All-Ireland Under-21 Football Championship final. In 2003 he led Limerick to a Division 2 National Football League (NFL) final, where they were beaten by Westmeath on the same day that Laois lost to Tyrone in the Division 1 decider.
The following year he led Limerick to a defeat of Laois in a Division 1 NFL tie at the Gaelic Grounds, and, that year, Limerick reached the Munster Senior Football Championship final, which they lost on a replay to Kerry.
Kearns spent six years managing Limerick and helped to raise the county's profile.
Following a heavy defeat to Cork in the 1999 Munster Senior Football Championship, at Pairc Ui Rinn, Limerick Football Manager, Paddy Mulvihill and his selectors Eddie Ryan and Sonny Crowley stepped down. Liam Kearns was the choice to succeed Paddy Mulvihill as manager. He also took the Limerick Under 21 football job. Limerick had reached successive Munster Minor Football Finals in 1997 and 1998 and a crop of promising talent was beginning to emerge at Under 21 level. The creation of a County Football Board in Limerick a few years earlier was taking effect.
In the Spring of 2000, Limerick beat Cork at Pairc Ui Chaoimh, and then Waterford at Dungarvan to win the Munster Under 21 Football Championship, captained by John Galvin. Kearns then led them to the All Ireland Final after defeating Westmeath in the All Ireland Semi Final at Portlaoise. The All Ireland Final against Tyrone, played at Mullingar was to end in defeat. Tyrone would dominate football at Senior Level for the next decade and their manager would become well known, Mickey Harte.
Liam Kearns’s Munster Senior Championship began in Kilmallock in 2000 against reigning Munster Champions Cork. He infiltrated the team with the successful Under 21 players and they gave Cork a serious contest, before bowing out in the end. However there were signs that Limerick were showing promise and building under Kearns.
In 2001, Limerick made a brave bid to defend their Munster Under 21 title. They beat Tipperary at Mitchelstown, but were dethroned in the Munster Final at Kilmallock by a Cork team including Graham Canty. Kearns stood down as Limerick Under 21 manager later in 2001, citing a wish to focus exclusively on the Limerick Senior Football job.
For the 2001 Championship, John Galvin had gone travelling, but a number of the younger players had emerged, and they performed creditably in Killarney in the Munster Senior Football Championship, losing in the end by 1-15 to 0-10. In the first year of the qualifiers, they were drawn at home to Westmeath, and were beaten comprehensively in the end, though not without showing signs of promise throughout the year.
In 2002, with the Under 21 commitments deferred to a new management team of Liam Fahy and Tom Casey, Kearns prioritised the league. Kerry were beaten at the Gaelic Grounds in a group game, but Armagh proved too strong at the Athletic Grounds on a day that Dual Player Stephen Lucey was playing with Limerick hurlers in Thurles. Nevertheless, Limerick footballers remained in the hunt for promotion, but slipped up against Louth and missed out.
Their championship was to prove more fruitful. An early goal from Johnny Murphy (now an intercounty hurling referee) set them on their way against Kerry at the Gaelic Grounds in the Munster Senior Football Championship. However Kerry found some late scores, and advanced in the championship by 0-14 to 1-7. Learnings were taken from defeat and a qualifier odyssey began with home (draw AET) and away (victory) games against Cavan, followed by a home win over Offaly, and finally a defeat to Mayo at Dr Hyde Park. Liam Kearns was making his mark at senior level. Limerick had played 5 top class competitive championship matches in 2002 culminating in a loss to Mayo by a single point, 0-13 to 1-9.
The year 2003 saw Liam Kearns take Limerick to another level, reaching the Division 2 League Final, gaining promotion to Division 1 for 2004 in the process. They lost to Westmeath in that League Final by a single point, but atoned a week later by dumping Cork out of the Munster Championship on a scoreline of 0-16 to 0-6. Clare were beaten before a Munster Final appearance awaited in Killarney. Kerry were victorious by 1-11 to 0-9 after Limerick had missed two penalties. Limerick lost to Armagh in the subsequent All Ireland Qualifier at Dr Hyde Park, Roscommon.
In 2004 Limerick reached a National Football League Division 1 Semi Final after a strong run of form through the group stages. They were beaten by Kerry at the Gaelic Grounds. It was widely seen as a great opportunity to beat Kerry. Having beaten Tipperary (0-16 to 3-5) and Waterford (1-18 to 0-7) in the Munster Championship, they had an even better opportunity to beat Kerry in the Munster Final at the Gaelic Grounds. Three late Eoin Keating frees were caught above the crossbar by Darragh O’Shea with a those inches depriving Limerick of a historic Munster Title. The game finished 1-10 to 1-10. The replay in Killarney was won by Kerry by 3-10 to 2-9 and the show was over. A qualifier defeat to Derry (0-10 to 0-7) finished the season at Dr Hyde Park Roscommon.
Liam Kearns returned for one last act in 2005, but Kerry beat them convincingly in the Gaelic Grounds. The Munster title dream was over and Kearns departed at the end of the season following a qualifier defeat to Derry at McHale Park Castlebar by 0-13 to 0-9 having beaten Carlow in an earlier qualifier by 2-15 to 0-7 at Dr Cullen Park, Carlow.
Laois
Tralee man Kearns (whose mother is from Laois) was appointed Mick O'Dwyer's successor as senior Laois county football team manager in September 2006. In being appointed he saw off the challenge of former Laois player Pat Roe, who had a successful spell in charge of Wexford.[3] Laois reached the finals of both the O'Byrne Cup and Leinster SFC in his first season as manager: calls for Kearns to be sacked after one season, with former players and club delegates saying "the man has to go", went unheeded.[4] He lasted until August 2008.[5]
In November 2015, Kearns was named as manager of the Tipperary senior football team.[6][7][8]In June 2016, Tipperary reached the Munster SFC final after a 3–15 to 2–16 win against Cork. They went on to defeat Derry by a scoreline of 1–21 to 2–17 in round 3A of the qualifiers to reach the All-Ireland SFC quarter-finals for the first time.[9] On 31 July 2016, Tipperary defeated Galway in the All-Ireland SFC quarter-final at Croke Park to reach a first All-Ireland SFC semi-final since 1935.[10][11][12] On 21 August 2016, Mayo defeated Tipperary in the semi-final by a scoreline of 2–13 to 0–14.[13][14][15]
^"Kearns reappointed as Laois manager". RTÉ. 10 August 2007. The Austin Stacks clubman has strong Laois connections and his father Ollie was a wing forward on the Graiguecullen team that won the club's last Laois SFC title in 1965.
^"Kearns appointed in Laois". Hogan Stand. 26 September 2006. Liam Kearns was ratified as the new Laois football manager at a county board meeting on Monday night, September 25.