Hi guys just jumping in here (ex michigander, so I'm entitled :rofl:) kidding...just want to keep clarifying that there is a huge difference in "hardy" and tender succulents, many of the hardy succulents are from alpine regions (mountains higher than tree line) so they get that type of environment; rocky, windy it can be wet but the water runs off because these guys are in clefs of rocks with little soil...it is why these guys usually don't do all that well indoors, there isn't wind, its cold and since other plants like water, they usually get watered at the same time and are sitting in soil that stays more wet than what they want/need.
Then there are the "tender" succulents, they're from places like south african, mexico, brasil, usually areas with temps that never dip below 45F, often these guys are in rocky areas with little rainfall, and most times bright light. From my experience there is a wide range of what these guys can handle temp wise (on the low end) but I err on the plus side and keep temps in 40's if I'm gonna put them outside, I definitely want to wait until nighttime temps are in the 40's (no danger of frost - Haworthia's (Jennifer, your zebra plant) are very susceptible to getting cold, so if they're in the mix of plants in your pot, then I'd wait!
I hope this info is helpful! As has been noted else where I tend to be long winded!
Another quick note, even when I water with these plants I only give a sip, I have "tropicals" (like spider plants) and ferns and with them I water until the water runs out of the bottom of the pot - I would never do that with succulents!!
Cheers
