Goals by Danilo Orsi and Klaidi Lolos in the first half earned the three points which were enough for Scott Lindsey’s team to finish seventh. They’ll play MK Dons in a two-legged play-off semi – and will be off to Wembley if they come through.
The home leg is on May 6, the away leg May 9.
Photographers James Boardman and Stephen Lawrence of Telephoto Images were there to capture the action and the great post-match scenes as fans invaded the pitch and the players and management came out into the stand to join in the fun.
See the best of their celebration and action pictures on this page and the ones linked – and be sure to get the Crawley Observer on Wednesday for all the action and reaction.
1. Chris Dyson Photography
Chris Dyson Photography:Action and celebrations from Crawley Town's win over Grimsby, which clinched their League Two play-off place Photo: C DYSON:James Boardman / Stephen Lawrence / Telephoto Images
2. Action and celebrations as Crawley Town reach the League Two play-offs by beating Grimsby (29).jpg
Action and celebrations from Crawley Town's win over Grimsby, which clinched their League Two play-off place Photo: Dov Friedmann:James Boardman / Stephen Lawrence / Telephoto Images
3. Chris Dyson Photography
Chris Dyson Photography:Action and celebrations from Crawley Town's win over Grimsby, which clinched their League Two play-off place Photo: C DYSON:James Boardman / Stephen Lawrence / Telephoto Images
4. Action and celebrations as Crawley Town reach the League Two play-offs by beating Grimsby (28).jpg
Action and celebrations from Crawley Town's win over Grimsby, which clinched their League Two play-off place Photo: Dov Friedmann:James Boardman / Stephen Lawrence / Telephoto Images