Key:
CC: Specsavers County Championship
50L: Royal London One-Day Cup
T20: NatWest T20 Blast
UNI: University Match
TOUR: Tourist Match
| April | UNI | Fri 7 - Sun 9 | Cardiff MCCU | Hove | CC | Fri 14 - Mon 17 | Kent | Hove | CC | Fri 21 - Mon 24 | Nottinghamshire | Trent Bridge | 50L | Thurs 27 | Middlesex | Lord's | 50L | Sun 30 | Somerset | Hove |
| May | 50L | Tues 2 | Glamorgan | Hove | 50L | Fri 5 | Kenttd> | Canterbury | 50L | Sun 7 | Surrey | Hove | 50L | Wed 10 | Essex | Chelmsford | Floodlit | 50L | Sun 14 | Gloucestershire | Eastbourne | 50L | Wed 17 | Hampshire | Ageas Bowl | Floodlit | TOUR | Fri 19 | South Africa | Hove | Floodlit | CC | Sun 21 - Wed 24 | Durham | Hove | CC | Fri 26 - Mon 29 | Kent | TBC |
| June | CC | Fri 2 - Mon 5 | Worcestershire | Hove | CC | Fri 9 - Mon 12 | Leicestershire | Grace Road | 50L | Tues 13 | Quarter Finals | TBC | TOUR | Wed 14 - Sat 17 | South Africa 'A'* | Arundel Castle |
| 50L | Fri 16 - Sat 17 | Semi Finals | TBC | CC | Mon 26 - Thurs 29 | Gloucestershire | Hove | Floodlit |
| July | 50L | Sat 1 | Final | Lord's | CC | Wed 5 - Sat 8 | Leicestershire | Arundel Castle | T20 | Sun 9 | Glamorgan | Arundel Castle | T20 | Wed 12 | Hampshire | Hove | Floodlit | T20 | Sun 16 | Gloucestershire | Cheltenham | T20 | Thurs 20 | Hampshire | Ageas Bowl | Floodlit | T20 | Fri 21 | Glamorgan | SSE SWALEC | Floodlit | T20 | Sun 23 | Kent | Hove | T20 | Fri 28 | Middlesex | Hove | Floodlit | T20 | Sun 30 | Somerset | Taunton |
| August | T20 | Thurs 3 | Surrey | Hove | Floodlit | T20 | Fri 4 | Kent | Canterbury | Floodlit | CC | Sun 6 - Wed 9 | Wocestershire | New Road | T20 | Thurs 10 | Middlesex | Lord's | Floodlit | T20 | Fri 11 | Gloucestershire | Hove | Floodlit | T20 | Sun 13 | Surrey | Kia Oval | T20 | Fri 18 | Essex | Hove | Floodlit | T20 | Tues 22 - Fri 25 | Quarter Finals | TBC | CC | Mon 28 - Thurs 31 | Glamorgan | Colwyn Bay |
| September | T20 | Sat 2 | Finals Day | Edgbaston | Floodlit | CC | Tues 5 - Fri 8 | Northamptonshire | Northampton | CC | Tues 12 - Fri 15 | Derbyshire | Hove | CC | Tues 19 - Fri 22 | Durham | Emirates Riverside | CC | Mon 25 - Thurs 28 | Nottinghamshire | Hove |
Note: *South Africa ‘A’ will play Duke of Norfolk XI if Sussex reach the Royal London One-Day Cup knockout stages