New Alpine SFG'er in Nordegg, Alberta, Canada

I'm newish to gardening and am trying the SFG method as my first forray into a real vegetable garden. Just wondering if anyone has any experience/tips on gardening in a mountain region? It was 20 degrees celcius yesterday (about 71 F) and today it is snowing. It also isn't unheard of to get a snowfall in the middle of July and August here even if its been really hot and dry before that.
Which kind of sucks because I really want to grow tomatoes and cucumbers. If you have ever had to pay $3.49/lb for tomatoes or cucumbers you can probably relate as to why I want to grow my own. I also live an hours drive away from the nearest grocery store and quite often the produce selection is less than ideal and often over ripe.
Any hints, tips, recommendations, etc. would be greatly appreciated.
Oh and I also have a problem with deer. I have tried several methods that are supposed to deter deer from your garden such as double fencing, soap, cayenne pepper, commercial pest repellents, tea tree oil and water,etc. but nobody told the deer around here that these methods are supposed to work because they didn't. In fact the deer coming into my yard have aquired a taste for several plants that they are supposed to hate and not eat such as chives and garlic. They ate it ALL! And then they ate my mint and my echinacea. Now I have healthy deer with great immune systems and minty fresh breath who arrive in my yard in groups as big as 8 or 9, leave their fawns for me to babysit while the mommy deer go do what mommy deer do and then the babies eat all my bird seed. I do love the creatures but not the waste of time and money when they eat all my hardwork that I haven't been able to even try yet. Anyone else have the same or similar problems?

Hello, Nordegggirl. I am sorry that you posted a question and got no responses. It is possible that no one else here does share your climate challenges - boy do you have challenges!

I am in a completely different area, but I was wondering about two things for you.

I don't know if an inexpensive un-heated greenhouse would be a possibility for you? I have seen some that get good reviews as low as $500. They have temperature activated vents, as protection for high temperatures. Green houses have their own challenges, as a closed system. My other thought would be hoops over your garden boxes. Especially in a climate where you can go from summer to winter and back again, if you have the ability to put on shade cloths, and frost cloths...

Anyway, if you are still here and haven't been scared away by our unintentional rudeness, check in and maybe we can come up with some help!

You certainly have your share of challenges. If not an actual greenhouse, maybe one of those SFG sized ones that fit over the box.

I do remember when I was in Switzerland in the Bernese Oberland that everyone had a small vegetable garden and they all seemed to be growing the same thing. I believe tomatoes was one of them. There are several varieties specific to cold areas and most have the word "Russian" in them. And there is always Early Girl.

I would have a plastic covered PVC pipe cage or something at the ready for those wintry summer says. I heard somewhere about sticking a candle in the ground in a covered bed to help with warmth?