I grew up with asthma and allergies. As I got in my 30s and 40s the frequency of attacks lessened, however cold weather can trigger tightness in my chest and difficultly breathing. There is also exercise induced asthma which varies with each individual. I don't recieve shots anymore but still have to use an inhaler and carry one when I ride. My advice is talk to your Doc and see if an inhaler can work for you. Theres been times riding that the inhaler got me back to the car. In my experience conditioning can lessen the frequency or severity of the attacks but at least in my case it happens regardless of what kind of shape I'm in. Hope this helps.

I have had asthma since I was about 11-12 years old. I have it year round but mine definitely gets worse in the winter. Right about now I can feel it getting worse and it will continue to be a problem until the warmer weather returns. Last year was bad because winter kind of continued for longer than usual with some pretty cold temps through march or so. It makes training for early Spring races like in April something of a challenge. What triggers it is really a combination of breathing in the cold air of winter but also the "forced heat" that you get inside is very dry and irritating to your bronchial system. So anyway I just try to limit exerting real hard when the temps are very low and basically just kind of suck it up and wait till it gets warmer and my symptoms lessen again. I avoid racing in the winter- last year I did the winter short track and that was kind of a bad idea. Each week my breathing got worse and worse. Definitely get to a good doctor. I take two separate inhalers daily to be able to function and then I have a third rescue inhaler that I have with me when I ride. I will not ride without it. Like someone else said conditioning doss help as does getting on a good regular regimen that will stop the inflammation from building up in the first place.

Good information at WebMD

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You might want to hold on the Zertec in the winter if there are no triggers for your allergies.  Antihistamines dry you out, and are not a brochodilator.    This could cause and increase in wheezing.   I had cold induced brochospasm when I lived up north (temperatures much colder than here).  I would just take a couple hits of my inhalator pre-ride/run and that was all it took.