Do I need to cook cauliflower before freezing it

[saltire]

Got 2 big fresh ones at the market, but want to freeze some

I would just chop into florets and freeze raw.

Ok, it won't go brown though will it?

Cut it into florets, plunge in boiling water and boil for a couple of minutes. called blanching. Plunge into cold water until cold,drain and freeze. No brown cauliflower.

just blanch it for two minutes in boiling water.