Chicken molted in fall now again in spring???

[houdinimyhoudan]

Hello I have a leghorn that is a year this month. But she unusually had her first molt last fall,November (I thought it was at 18 months she was 6 months) and now it appears she is molting again this march. Is this usual to molt twice in 1 year. All the other chickens are fine. Last fall the only one that followed suit was the other leghorn hen. But as of now no one else appears to be molting.
Is this. Normal? Or is it something else? So I be worried? If so what should I do?

Thank you

 

[CascadiaRiver]

Some of ours are stress-molting because we lost a hen earlier this year, anything like that happen? Maybe hawk attacks?

 

[houdinimyhoudan]

No, but we live in Colorado. And the weather has been very drastic this year either 30 degrees and crazy windy or unusually hot and very sunny like 70+ degrees