England Test captain Joe Root has signed a three-year contract extension with Yorkshire until the end of 2022.
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.
Yorkshire's Somerset-bound seamer Jack Brooks has won the PCA Player of the Month gong after steering his side to survival.
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.
Essex's Jamie Porter and Sam Cook claimed four wickets each to condemn Surrey to a day to forget at the Kia Oval.
Adil Rashid has agreed a new one-year all-format deal with Yorkshire to extend his 12-year affiliation with the county.
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.
Kane Williamson discusses his time with Yorkshire, the global expansion of T20 and safeguarding Test cricket for the future.
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.
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.
Lancashire enjoyed an excellent opening day of their Division One relegation battle with Yorkshire at Headingley.
Rory Burns and Rikki Clarke make the team as Surrey edge closer to the Division One title while Matt Henry impresses for Kent.
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