If they really are enforcing snow tires or chains requirement, you may have a problem. Although the stock Contis are probably good enough to handle a few inches of compacted snow if you take it easy, they aren't snow + ice rated and the highway patrol may not be impressed when you show them the snowflake on your Terrain Response knob (but you can try)... :wink: The accessory chains Land Rover sells for the Sport won't work on low profile tires such as your 20s - they only fit 18 and 19" stock setups - and nobody was able to suggest an aftermarket chain that could fit a 20" rim last year, when a similar post came up. Of course, you could buy a set of 20" snow tires (the 275/40/20 Pirelli Scorpion Ice&Snow always become available around this time of the year), with those tires on a 4x4 I am sure they would let you through without objections. But that seems like such a waste of money if this is a one-time round trip, plus you're leaving tomorrow.
Good luck to you and have a great trip, that's quite a hike in one shot even without snow to slow you down. I hope the weather forecast is wrong. Every time I go up to local mountains when "chains or snow tires" are required in winter around here, I never get stopped by anyone, there are checkpoints but they wave me right through (my 18" all terrain tires are not snow rated, although they look like they could be... Perhaps that's good enough for CHP.) In that case, set your TR to snow, switch to CommandShift, slow down and don't touch the brakes unless you really have to. You'll be fine.

Happy Thanksgiving!