Kent and Durham will kickstart the Twenty20 Cup quarter-finals at Canterbury on Monday, 27 July.
Their match, which starts at 1730 BST, will be followed on the same night by Sussex against Warwickshire at Hove, which is scheduled for 1910 BST.
Lancashire host Somerset the following day at Old Trafford at 1740 BST, with Northamptonshire and Hampshire playing at 1740 BST on Wednesday, 29 July.
Twenty20 Cup finals day is at Edgbaston on Saturday, 15 August.
Twenty20 Cup quarter-final draw
Monday, 27 July
Kent v Durham, 1730 BST
Sussex v Warwickshire, 1910 BST
Tuesday, 28 July
Lancashire v Somerset, 1740 BST
Wednesday, 29 July
Northants v Hampshire, 1740 BST