Your RC Leghorns will do fine, you just have to breed them. In scenarios like this, it's not good to talk about breeds, you need to talk about strains. If you're serious about working with a breed, you need to maintain a good number of them, and then make winter hardiness a strong point of selection. In a few years you'll have a bunch of toughies, and the rest are soup. One talks about breeds to get ideas; one talks about strains to get realities. This is why folks need to learn to start breeding. You develop the birds that are right for your macro and microclimate. Obviously, there are important things to consider, i.e. comb-type, etc.. that are predisposed to strengths and weaknesses, but the trick to success is in the individual breeding of each strain, which is only as good as each generation.
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