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.
Middlesex's former England batsman Nick Compton has retired from all forms of cricket at the age of 35.
Our pundits select XIs from Divisions One and Two plus a 'most promising' team from the 2018 County Championship season.
Craig Overton became the second Somerset player in as many days to take a hat-trick as they beat Nottinghamshire at Taunton.
Tom Abell took a remarkable hat-trick as Somerset forced Nottinghamshire to follow on at Trent Bridge.
Stuart Law will take over as Middlesex head coach in January after leaving his role as Windies coach in December.
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.
Hampshire, whose safety was confirmed by Worcestershire's defeat at Essex, suffered a rain-affected day against Yorkshire.
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.
Morne Morkel edged Surrey closer to a win over Worcestershire and their first County Championship title in 16 years.
Lancashire enjoyed an excellent opening day of their Division One relegation battle with Yorkshire at Headingley.
Surrey's seamers blew away County Championship title-holders Essex as they extended their lead at the top of Division One.
Keshav Maharaj took 7-37 as his side snatched a dramatic tie in their astonishing County Championship clash with Somerset.
Surrey skipper Rory Burns scored 90 at Essex as he became the first batsman to 1,000 County Championship runs this season.
Surrey moved closer to their first Championship title since 2002 after crushing Nottinghamshire by an innings at The Oval.
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