How cold is too cold

A stiff breeze aggravates the formation of ice (makes it happen faster).

Thanks guys. I am pretty sure the CG's water won't yet be on so it will be from my tanks. Sounds like I will be fine, especially since everything underneath is enclosed.
thanks again,
Chris

We often camp in these temps, but as long as temps rise during the day we've never had any issues. We run off of FW tank and although some lines are exposed, it's not cold enough for long enough to freeze our lines. We have been caught off guard with inaccurate weather forecasts a couple of times and experienced frozen plumbing, but we didn't have any issues after lines defrosted. Enjoy your trip!!!

Our very first trip in our little motorhome saw temps down to -10 C, 15 F overnight and lots of snow. I was worried and did lots of checking - noticed the freshwater drain valve froze closed and put a mitt over it. Checked the taps inside several times during the night and left the furnace on and cupboard doors with pipes behind open. I had a jug of RV antifreeze ready in case we had to winterize. But all was well and we have never worried about -10 since. A remote thermometer is very handy for monitoring the temperature at what you guess is the most vulnerable pipe.

I should add that we have a kitchen sink drain pipe that runs across the underside with only the metal sheeting between pipe and outside world. The elbow on that pipe cracked the next year and it might have been due to lying water freezing in it (or due to that pipe system to the sink being too long and rigid for travel on rough roads). If you have a vulnerability like that you should be prepared to pour a cup or two of antifreeze down to help you sleep at night.

I will not worry about mid 20's low temps if the days are warmer.

I never unhook the city water in these conditions. All the water in your hose/pipes does not immediately freeze hard as soon as the temp hits 32. It takes awhile, even dipping down into the high 20s.

I also happen to be a male in my late 50s so that water is moving through the pipes a few times during the night :-)

While in use you should be fine to at least 25.

As long as you're running the heat at night and your underbelly is covered, you'll be fine, the cabin heat will keep the entire trailer above freezing... As another poster mentioned, if you have a city water connection, you may want to disconnect it over night, or turn it off..

Dropping down into the 20's over night is fine as long as it warms up the next day. We have a 3 season trailer that has no heated tanks, etc. and we see the 20's at night all the time.

As previously suggested use your fresh water tank. Temps you described are balmy compared to what we have been campin in this winter. Some of our best camping is in cold or wet temps before the multitudes come out to play.