Yorkshire re-sign New Zealand international batsman Kane Williamson for a fourth spell with the county.
County champions Essex begin the defence of their title in 2018 against Yorkshire at Headingley on 13 April.
England wicketkeeper Jonny Bairstow opens up to Michael Vaughan in a special interview for BBC Radio 5 live.
Yorkshire director of cricket Martyn Moxon says coach Andrew Gale has the county's full support despite a difficult first season.
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Watch highlights of Adam Lyth's 161 as he breaks the domestic record in Twenty20 cricket as Yorkshire make 260-4 against Northants to amass the highest domestic T20 score.
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How to get into cricket - physical exertion with a chess-like element in matches which range from half an hour to five days.