Karl Krikken will have to re-apply for his job as Derbyshire head coach after the club announce management re-shuffle.
Batsman Dan Redfern leaves Derbyshire by mutual consent with two years left on his contract.
Durham will start the defence of their County Championship title with an away game against Northants on 13 April next year.
Derbyshire County Cricket Club bids for funding for a £3.65m ground redevelopment, with a view to hosting a 2019 World Cup game.
Derbyshire captain Wayne Madsen signs a new contract which keeps him at the club until the end of the 2016 season.
Derbyshire batting coach David Houghton leaves the club as part of cost-cutting measures after a management review.
Derbyshire offer a one-year deal to Ben Slater and summer contracts to Jonathan Marsden and Greg Cork, son of Dominic.
Derbyshire sign ex-Notts batsman Scott Elstone, but there is no new deal for Ben Slater and Alasdair Evans is released.
BBC commentators select and give the lowdown on county cricket's best XI of 2013
Derbyshire are relegated from County Championship Division One, losing to Warwickshire by an innings and 158 runs.
Warwickshire's Chris Woakes completes a career-best 152 not out to plunge Derbyshire even closer to relegation.
Chris Woakes responds to his England snub by hitting a century to rescue Warwickshire at Derby.
Derbyshire captain Michael Madsen says they are full of optimism for this week's win-or-bust Division One County Championship game against Warwickshire.
Graham Onions inspires leaders Durham to an incredible win over Derbyshire to put them in the title race's driving seat.
Rain brings an early end to day three of Derbyshire's clash with Durham to leave the game heading towards a draw.
Chris Rushworth and Graham Onions share nine wickets to boost Durham's title hopes in their game with Derbyshire.
Derbyshire frustrate Division One leaders Durham on a rain-shortened first day at the County Ground.
Shivnarine Chanderpaul's 74 not out steers Derbyshire to a crucial two-wicket win over Somerset at Taunton.
Ben Slater's half century helps set up an intriguing final day between strugglers Somerset and Derbyshire.
Somerset pair Nick Compton and James Hildreth share a stand of 116 but Derbyshire remain on top at Taunton.