[5] Following an upturn in the club's form, with Crawley losing just 2 of their following 11 matches, Yems' contract was extended until the end of the 2022–23 season in late January 2020.

[7] The season was later cancelled, with Crawley finishing 13th after clubs agreed to base the final table on points per game.

[1][8] Following the conclusion of the previous season, defender Jamie Sendles-White, midfielders Jimmy Smith and Josh Payne and forward Ibrahim Meite were all released following the expiration of their contracts,[9][10] whilst David Sesay, Josh Doherty, Ashley Nathaniel-George, George Francomb, Dannie Bulman and Lewis Young all signed new contracts.

[18] Across the summer 2020 transfer window, the club brought in defenders Archie Davies and Tony Craig from Brighton & Hove Albion and Bristol Rovers,[14] midfielders Samuel Matthews, Tyler Frost and Jake Hessenthaler from Bristol Rovers, Reading and Grimsby Town,[19][14][20] forward Sam Ashford from Hemel Hempstead Town[21] and winger Zaid Al-Hussaini,[22] all following the expiry of their contracts at their previous clubs.

[28] Crawley's third friendly match took place three days later, with the club drawing 1–1 against the Watford under-23 team at Hop Oast in Horsham.

[29] Crawley started the season with a home EFL Cup tie to Championship side Millwall in the first round of the competition on 5 September 2020.

Torquay were 2–0 up at half-time with goals from Aaron Nemane and Ben Whitfield, before a head injury early in the second half saw keeper McGill substituted in place of new signing Nelson after the game was held up for 16 minutes.

Crawley defender David Sesay was sent off after 80 minutes, having received a straight red card for a professional foul.

[64] Crawley took the lead against Leyton Orient in the 15th minute with a Josh Coulson own goal again following a Matthews free kick.

[66] Crawley opened the scoring at home to second-placed Forest Green Rovers through Nichols in the 16th minute after a pass from Hessenthaler.

[68] Josh Wright, brother of Mark, signed for the club on a two-and-a-half-year deal, following his release from Leyton Orient.

[69] Crawley progressed to the fourth round of the FA Cup after defeating Premier League side Leeds United 3–0.

After a goalless first-half, Crawley took the lead in the 50th minute after Tsaroulla finished into the bottom right corner after a 'twisting run into the area'.

[72] Crawley signed midfielders James Tilley and Jordan Maguire-Drew as well as forward Davide Rodari; Tilley signed for the club following his release from Grimsby Town,[73] Maguire drew on loan from Leyton Orient[74] and Rodari from Isthmian League side Hastings United for an undisclosed fee.

[75] Top scorer Max Watters left the club, signing for Championship side Cardiff City for and undisclosed fee.

[81] Crawley were 3–0 down at half-time at home to Harrogate Town following goals from Aaron Martin, Josh March and Simon Power.

[83] Crawley defeated Colchester United 1–0 at home, with substitute Tilley scoring the only goal of the game in second-half stoppage time.

Former Crawley midfielder Morais scored Grimsby's opening goal before Powell equalised directly from a free-kick in the 30th minute.

[90] Crawley defeated Mansfield Town 1–0 at home following a goal from Tilley in the second minute of second-half added time.

Scott Quigley restored Barrow's lead five minutes later from the penalty spot following a foul from Craig on Bobby Thomas.

Jack Powell equalised for Crawley with a header in the 84th-minute before Quigley won the game for Barrow with a long-range goal in the fifth minute of added time.

Tilley got a goal back for Crawley in the 90th-minute following a corner before Dylan Bahamboula scored Oldham's fourth in the fifth-minute of added time from close range.

[101] Crawley drew 0–0 at home to Forest Green Rovers as the visiting side "failed to take advantage of plenty of chances".

[103] Arthur Read scored again to put Stevenage ahead for the third tine in the 81st-minute, though Powell equalised again for Crawley in the 92nd-minute with a "stunning" goal from 20 yards.

[103] Crawley lost 4–1 at home to Bolton Wanderers in the final match of the season as the visitors were promoted to League One.

[104] Antoni Sarcevic scored the opening goal for the visiting side in the 9th-minute, before Oladapo Afolayan doubled their lead 17 minutes later.

[106] The draw for the first round was made on Monday 26 October, with Crawley drawn away to National League side Torquay United.

[109] The third round draw was made on 30 November, with Premier League and EFL Championship clubs all entering the competition.

[111] The first round draw was made live on Sky Sports on 18 August 2020, with Crawley being drawn at home to Championship side Millwall, with the match set to be played on 5 September 2020.