I've moved and in the new house I'm short of ammo storage room at least for six months or a year maybe longer. I live in Texas and it is hot. Putting security issues aside, will the heat deteriorate modern ammo. I will keep target grade ammo and high dollar SD ammo in the house. The bulk ammo, some of which is remanufactured, I was considering the garage. I'm guessing the military stores ammo for years in unconditioned environment but not sure.

I think that 90 degree temps will eventually degrade your ammo.
I keep everything inside my house because of the heat.

Yes, mil ammo is stored in sealed ammo cans in bunkers in some pretty extreme temps without problems. MOISTURE getting into ammo containers should be prevented, like by using ordinary ammo cans. Ammo will last longer than you in the heat, by far.

P.S. I live in SW Oklahoma, where we routinely have 100 summer days near/over 100 degrees. I've had ammo in the garage every summer for 25yr with no issues.

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Science plus Art

"It's not the heat, it's the humidity."

Sorry, just couldn't resist. Keep them sealed up with maybe some desiccant in the container with them and they should be fine, I would think.

The ammo should store safely without significant degradation in a Texas garage for 6-12 months. I have read, but have no first hand experience, that heated ammo generates slightly higher pressures so if your ammo is cooking in sunlight you might let it cool down before shooting with it. I'm not sure about Texas law but obviously make sure you keep the ammo secured.

I suspect you are not a bachelor as any bachelor would find a place in even cramped living quarters for their ammo:
-microwave
-refrigerator
-kitchen cabinets
-dresser

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Scoundrel & Ne'er-Do-Well

LOL-Guilty! Married 48 years and trying to avoid the divorce

Short term, 12-18 months, it shouldn't degrade much, if at all. I wouldn't store it there 5 or 10 years though.

Styrofoam (cheap) coolers with those desicant things in them-seal with black tape, and store low to the floor. JMTCW.

I have about 20 flats of shotgun shells that have been in my garage for over 10 years and last month I started shooting them and they work like brand new. Larry

I have stored all kinds of ammo in unconditioned garages in California and in Indiana for over 30 years with no problems. Some of it has been in ammo cans and some in its original boxes, it all goes bang when I use it.

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Woulda, Coulda, Shoulda

I prefer to keep all my ammo in the house but I do have some old
sealed case military ammo in the garage. I do have central air conditioning and my garage gets warm in the summer but not nearly
as hot as some storage building sitting out in the sun would. If you're
in Texas then you surely have central air, probably with an outlet in
the garage, so you shouldn't have to worry about any ammo stored
in your garage.

Moisture is not your friend.

Moisture can be created by temperature changes. So heat is one thing, but try to store ammo where the temp will remain relatively constant.

Folks wrap their model trains in bubble wrap and put them in the attic. Ouch! I wrap them in wax paper, leaving the ends wide open, so air gets in and they don't sweat. Plus, mine aren't in the attic. But if they were, they'd probably be fine.

The only problem I ever had storing ammo in a garage was when I used to live up in northern Wisconsin in the late 00s. At the time, I stored shotgun shells (for trap) out in the garage and had as many as 30-40 flats of them out there----with the temperature varying between 10-20 below zero F. in the winter and 90 degrees F. in the summer, with very high humidity, in the summer as well. Long story short, over the course of several years a light coating of rust developed on the metal base of the otherwise plastic shells----other than cosmetics----and with the exception of one shell where the corrosion affected the primer-----each and every one of them worked just fine.

Back in the late 80s we bought our summer camp. (Now my year around house!) It was owned by a long retired NY City Police lieutenant.

Found some ammo (800 rounds in their cardboard boxes) way in the back of a closet shelf (.38 RNL) Called up the X owner and asked him about it. He laughed and said I left it for you. I asked him how old was it and he said at least 25 years old.

Now you got to understand this is Northern NY and the temperatures can go from about 96F to -30F over the course of a year. We can get a very high humidity in the summer! Multiply that times 25 and that ammo has seen a lot of tempt changes. There was no AC or heat in that summer only place!

That ammo worked perfectly. All rounds fired, all sounded right and the recoil was right. I fired off the last of it a year ago and it still was fine. Full disclosure after I found the ammo I took it home and for the rest of its life it was in a better temp/humidity controlled area.

Based on that I believe a few months in a garage, your ammo will be fine.

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14 S&W Revs none with locks!

Many, many, many years ago One of my daily duties was to record the temperatures of lowest and highest in the magazine bunkers for the past 24 hours. IIRC most of the "Ready" ammo was on shelves in just the factory boxes.

Thanks for the responses. I may be able to store all the ammo in a closet in the house. If not some bulk ammo will be store in the garage in some type of sealed containers. I like the suggestion of styrofoam ice chest sealed with duct tape. I have one 50 cal ammo container I can use as well.

As a contractor I've built hundreds of new houses with only one request to put an HVAC vent in a garage. He wanted to keep his prized Deloreon nice and comfy.

I've stored ammo in my attic for I know over 25 years and still shoots. Don't know if velocity was compromised though?

COOL & DRY is the way ammo manufacturers tell us to store their products. I personally would NOT store them in a hot & humid garage especially in your neck of the woods. Maybe you can find a friend or relative that can lend you some storage space in their climate controlled home for the duration. Otherwise I'd move the ammo onto an a/c'd part of the house.

I would put my foot down and at least get to store it........

under your half of the bed or a spare bed if you have that option.

Most women want all the closet room they can get.........
bargain.

Never haqd storage probs either. Before I started buying those wooden wildlife boxes to put my ammo in, I only kept what I had in their factory boxes inside another box full of paperback books. (((I didnt buy much ammo in days yore))) but, I had several boxes of vintage 30-40 that I finally got around to using. These rounds were already about 30 years or more old when I got them when I purchased my Krag Carbine some 18 or so years ago.

BTW, my ammo was never stored in a place with consistant temps. Fo years some was simply stored in a garage or attic. Our norm temps in my area vary from maybe freezing once in awhile-to over 1oo F in the hotter months. Already this morning, it was 96 F here. Anyway now, all my ammo is in a closet in an non-airconditioned bedroom.

FYI I received thousands upon thousands of rounds of ammo stored outside in an Arizona desert garage that that date back to the 60's 70's and 80's some in ammo cans, other stuffed in everything from cardboard boxes to wooden ammo crates...

haven't had a single issue with any of it as of yet since 2012-13 and I have shot a lot of it

I'm sure you'll be OK storing it in a garage, but a cool dry basement is best and you're better off keeping it in an old air tight GI ammo can. At any rate, keep it air tight and out of direct sunlight and it will be fine. When I put my ammo in the GI cans I leave the lid cracked and if winter put it next to a heat register for a few minutes. If summer in the sun for a few minutes to heat the can and remove any humidity. Then close it up and put it into my storage room in the basement where the temp remains a constant. If you store in a ammo can don't seal it up with humid air inside.

In Texas this is not a good idea unless you pack the ammo in an air-tight bag and add dessicant. Inside a wooden chest in my garage here in Houston I stored about 1000 rounds of 9mm ammo in the original 50-round boxes which were in turn placed in the plastic ammo boxes sold at Academy. After about a year about 50% of the the brass cases showed numerous spots of corrosion, some merely discolorations and others defined corrosion pits.

I kept a case of PMC 9mm ammo and a case of old Malaysian 5.56 military rounds in my garage in Phoenix, AZ for about 10 years. They were 100% good when I finally got around to shooting them. A warm humid environment may be a different story. I can't speak to that.