The jet stream is farther south this time of year. If you can ride it, you’ll have a very nice tailwind.
I'm assuming the SLC area? If so, you can make it through the pass from PVU to PUC to HVE and then to RSK and cut north of ABQ to ACH. Most of the terrain in the basins/valleys along that route is around 5,000-6,000 MSL. Like someone else said, climb to about 10k and you should be good terrain-wise along that route. From there you can make your way SE towards Florida...the easiest way is to fly just north of the FL panhandle to avoid the military restricted areas. Obviously, try and accomplish the SLC to ACH portion on days that will be severe clear. Scud running out there in a 150 will end poorly. Be aware of the winds to avoid severe turbulence. In the winter, it will probably be fairly bumpy due to mechanical turbulence, but avoid putting yourself close enough to mountainous terrain with strong winds that might exceed the 150's ability to climb.Any suggested routes to fly 150 from Utah to central Florida vfr only.
What part of UT? I too would head south along I-15 to LAS, then to Kingman AZ, but follow I-40 towards Flagstaff and into NM. Once past the "hills", then diagonally across TX and onward to FL.You'll have to go south, around the bottom of the Rockies, then east in a 150. It's been done, plan on unforecast layovers though. Sort of SLC to LAS to PHX thence east. Think it can be done with a max altitude of around 10k, which a 150 can get to eventually. Obviously weather has to be cooperative. Once you get to the Gulf Coast things should get easier, but be aware there's lots of military airspace along much of it's length.
It's pretty rare, but when those conditions happen, it's crazy. Wonder if we were near ya. I was stuck in Lubbock for three days sometime back then, too.Got stuck in Plainview TX for 3 days on the way back because of low ceilings. Hand-held GPS. 2000 (yr) or so and I still remember so many details of that trip. I’m a bit envious Safe flight!