The eastbound Amtrak arrives Denver 6:38 PM (18:38). How can I get to Fort Collins from there?
The Super Shuttle runs roughly hourly from Denver International Airport to Fort Collins, but the airport is 40 km from the Amtrak station, so that's a major detour, that would mean taking bus FX from Market Street Station 7:18 PM, arriving at the airport at 8:27 PM, then the super shuttle 9:05 PM, arriving Fort Collins CSU at 10:55 PM; almost 4 hours after departing from Denver.
Greyhound Lines appears to have a bus departing 12:45 AM, arriving 02:00 AM — although probably as quick as it gets, this is not exactly a comfortable time.
RTD Denver has transportation to Longmont and Flex from Longmont to Fort Collins, but the last bus from Longmont appears to depart 7:05 PM — so I won't make it there when arriving by Amtrak.
A taxi would cost an estimated 166 US$ according to Taxifarefinder.
Is there any other way to get to Fort Collins when arriving by the eastbound Amtrak, any way that I've missed?