This highly depends on what your surgeon says, but even if he says yes I'd ease into it. It also depends on what surgery you have (some newer surgeries have faster recovery rates) and how well you're doing with scar tissue etc... these are questions your surgeon should be talking to you about, not us.
Personally, my surgeon okay'd me to go LIGHT riding about 3-4 months after my surgery, but even then I held off a little longer until I believe it was about 6 months and even then it was very, very safe riding on green runs and my knee still didn't feel quite the same, so it honestly wasn't much fun.
Everyone is different with this, but it took me about 1 year or so before I was more comfortable with both snowboarding AND my knee started to feel more normal while riding. A lot of those random small muscles take time to return and re-strengthen (yoga is huge plus once you're able to later in your rehab) since you don't normally use a lot of those stabilizer muscles.
Honestly, here's the big thing you should be thinking and I don't mean to scare you or anything, but you don't want to come back too early, re-tear your ligament and ruin your knee even more.
I say this to everyone who asks this question: Is going back too early worth risking 5 or 10 or 15 years of snowboarding later in life because you can't walk anymore due to a stupid accident you took from re-injuring your knee.
Ask your surgeon, get a highly recommended sports physio (if they work with a major sports related team it's a plus), and listen to their advice. Everyone heals differently and you need expert advice from people who can actually check your knee in person and know what they're talking about.
I teach snowboarding via step-by-step videos lessons at
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