Can I walk on my artificial lawn during winter?

Just a thought as I've only seen my artificial grass during the summer. Will the cold, snow and frost damage my lawn?

It is perfectly fine for you to walk on your artificial grass lawn during winter time! Like walking on any surfaces in a snowy weather, you just need to be very careful as artificial grass can be slippery with snow or frost on it.
The snow or frost won't hurt your artificial grass at all, you surely can have a peace of mind about it. If you need to clean off the snow or frost from your artificial grass lawn surface, all you need to do is either blowing them off with a power blower or use garden broom to brush them off. You will find your artificial turf to be nice and clean once snow gets melted on them with water simply drains off immediately and you can start enjoy it right away. Not like real grass lawns that things are getting really messy and muddy when getting wet.

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Other than the grass being a bit slippery like almost every surface during winter time, I don't see anything else that could happen to it.

Absolutely! You won't have any issues at all.

Of course! A lot of people use it even during the winter.

Yes you can. Though you still have to be careful as it might be slippery.