Champions Surrey will begin their County Championship title defence at home to 2017 winners Essex at The Kia Oval on April 11.
Vitality Blast champions Worcestershire will kick off their title defence at Notts, with Finals Day set for September 21.
The County Championship will move to a 10-team Division One in 2020 after an agreement was on changes to the structure.
Our pundits select XIs from Divisions One and Two plus a 'most promising' team from the 2018 County Championship season.
Champions Surrey lost their unbeaten record with a tense one-wicket defeat to Essex in a stunning finale at the Oval.
Craig Overton became the second Somerset player in as many days to take a hat-trick as they beat Nottinghamshire at Taunton.
Essex's James Foster shares his top wicketkeeping tips with Rob Key in this Sky Sports Cricket masterclass.
Tom Abell took a remarkable hat-trick as Somerset forced Nottinghamshire to follow on at Trent Bridge.
Essex's Jamie Porter and Sam Cook claimed four wickets each to condemn Surrey to a day to forget at the Kia Oval.
Centuries galore and sensational bowling performances see Sam Robson, Ian Bell and Jamie Porter make this week's team.
Worcestershire have been relegated from Division One after falling to an innings and 129 run loss to Essex at Chelmsford.
Joe Clarke hit an unbeaten 74 as Worcestershire looked to cling on to their slim County Championship survival hopes at Essex.
Hampshire just shaded a bowler-friendly opening day against Yorkshire as 15 wickets fell on day one of their clash.
Rory Burns and Morne Morkel helped Surrey seal the County Championship title while Ben Coad was on song for Yorkshire.
Former England wicketkeeper James Foster will leave Essex at the end of the season and move into coaching.
Yorkshire secured a 95-run County Championship win over Roses rivals Lancashire to take a huge step towards avoiding relegation.
Morne Morkel edged Surrey closer to a win over Worcestershire and their first County Championship title in 16 years.
Alastair Cook will not play for Essex for the remainder of their Specavers County Championship season.
Lancashire enjoyed an excellent opening day of their Division One relegation battle with Yorkshire at Headingley.
Alastair Cook completed his 33rd century in his final Test innings for England before being dismissed for 147 against India.
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