No, that would not be a safe assumption. You are arriving on a Thursday for what I am guessing is a weekend stay.

Many front range folks wait until last minute for specials (or snow - see next paragraph), so this hotel will try to fill up. There are a lot of elites who stay at this hotel so depending on the length of your stay, your status, when you check-in (upgrades are based on availability at check-in), and what rooms the hotel has identified as being available for upgrade will determine whether or not you get an upgrade.

Also if it dumps next week, or is forecast to dump Thursday-Saturday, then all bets are off and the hotel will be booked solid.