I had my Yale zigbee lock (control4) on my front door in Minneapolis this last winter, no problems with it functioning.
The electronics essentially are all on the inside, sans the touchscreen on the outside.
The lock / deadbolt itself was functioning fine even in sub -20 days. The door, not so much, but the lock had no problems.
So - I live in NW MN and I have the Kwikset 912ā¦ (I tried to link the Amazon link here - but the site wonāt let meā¦ check it out there.)
The guts are all inside the house and I never had an issue. I do have a storm door outside of that - most certainly helped keep the lock a hair warmer - but really never had any concerns etc about it.
I also have a SmartThings Multi in my mailbox that notifies when the mail is here - and we had MANY -20 days this past winter and never once had an issue with the batteries actually. I would always get my push message when the mailbox was opened. (Granted it was a hair warmer by then - probably -10ā¦ but still - worked just fine in the chilly chilly winter.)
Found this older thread and thought Iād check back with folks on copy to see if anyone has found options for smart locks that fare better in colder climates since the OP back in 2014?
I have a Schlage FE599 lever lock and the first cold snap of the seasons (below 0) and the lockās batteries drained to 8% almost instantly, even with a glass storm door. Fortunately I donāt have any guests locked out of the vacation rental it secures, but this is definitely something I cannot have happen again.
Any other, non-deadbolt-driving ST locks you all have seen that fare better in extreme cold temperatures?
I would think an electric strike would probably do better since you can run it off of Mains power and itās usually the batteries that are the problem.
How i made my doors unlock... ON THE CHEAP (under $50) (electric strike)
Youād have to add a separate keypad if you wanted one, but you could put that in a sheltered box if necessary. A lot of security systems in cold weather climates do that.
@rboy is an expert on locks, I donāt know if he has any observations one way or the other on specific smart lock models.
Otherwise @tgauchat @yvesracine or some of our other Canadian members may have some ideas. 
Thanks @JDRoberts. Is suspect running the wiring needed to run the electric strike plate in this condo make implementation a non-starter, but Iāll keep that in the back pocket in case all other options fail.
And rboyās RLA is exactly what Iām using for code management, but thatās not helpful if the lock burns the batteries and I get no notification of low batteries until theyāre too low to operate anymore.
This particular lock also continues to fail in sending updates that a user code has been entered, which precludes my ability to leverage some of the more advanced functions of the RLA automations. Spent hours troubleshooting hub and outlet repeaters with no luck.
If I can find a solution to the cold weather issue Iāll probably keep this lock around for the season, but swap it out next year after a have a chance to test our some alternative locks with good battery life.
Thanks again for any/all suggestions from the community.
Have you tried lithium batteries? Their battery reporting isnāt as good because they will report 100% and then nose dive as they wear out but they last so much longer than alkaline. Believe they may withstand colder temperatures better too.
You can check out Yale locks also but the issue youāre facing has more to do with battery chemistry then the lock itself. You could try lithium 1.5V batteries which has a flat discharge curve and might survive lower temperatures better.
Plus the FE599 tends to shutdown sooner than Yale locks wrt battery voltage.
However do keep in mind that voltage characteristics of lithium 
are different so you need to replace them at a higher remaining percentage than alkaline batteries. For example if you replace alkaline batteries at 30% then the same remaining ācapacityā (ie energy) in a lithium battery may report 95%. The voltage curves are flatter and then very steep for lithium so while it will give you a longer battery life, donāt wait for it to get to 30%, itāll be dead before you get there.
