England fast bowler Olly Stone has signed a new contract to keep him with Warwickshire until the end of the 2022 season.
Champions Surrey will begin their County Championship title defence at home to 2017 winners Essex at The Kia Oval on April 11.
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.
Surrey captain Rory Burns hailed his team's character before lifting the County Championship trophy.
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.
Warwickshire have won the Specsavers County Championship Division Two title after beating Kent by an innings and 134 runs.
Tom Abell took a remarkable hat-trick as Somerset forced Nottinghamshire to follow on at Trent Bridge.
Lancashire's relegation from County Championship Division One has been confirmed after they were skittled by Hampshire.
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.
Yorkshire and Hampshire's clash at Headingley ended in a weather-affected draw as no play was possible on day four.
Warwickshire's high-scoring draw at Hove meant they reclaimed their Division One status at the first time of asking.
Somerset's County Championship match against Surrey has been abandoned after Storm Bronagh left the pitch unfit to play on.
Hampshire, whose safety was confirmed by Worcestershire's defeat at Essex, suffered a rain-affected day against Yorkshire.
Worcestershire have been relegated from Division One after falling to an innings and 129 run loss to Essex at Chelmsford.
Kent have been promoted to Division One of the Specsavers County Championship.
The County Championship will decide next week on a proposal to restructure into a 10-team top division.
Joe Clarke hit an unbeaten 74 as Worcestershire looked to cling on to their slim County Championship survival hopes at Essex.
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