The offices will reopen on Tuesday at 9am.
Tickets for the Maidenhead United FA Trophy game at Blundell Park on Saturday will go on sale on Tuesday morning from the ticket office, but are now available online.
The only stands open for this fixture will be the Upper Findus and Main Stand.
Prices are: £10 Adults, £5 Concessions and £1 accompanied juniors.
Don't forget! You can get the latest ticket news and purchase tickets online via your mobile at http://mobile.grimsby-townfc.co.uk