Even though there may be times of the year when ticks are more likely to be a problem as the article mentions, you should be aware that you can encounter them about anytime of the year in certain regions. I once lived in an area that was called a tick habitat. There were actually signs along the trails near my house that reminded hikers that the area was home to ticks and their habitat should be respected.
Anyway, I saw the ticks throughout the warm months and I assumed they would go wherever ticks and insects go during the winter and I would not have to deal with them until spring. This was not the case.
Even though, the area where I lived had cold weather and harsh winters in general, I could walk outside during the winter on a mild day and find ticks. I just assumed they would be buried deep in wood or in the ground, but there they were in the open.