In most cases, yes. However, there are some gender specific issues. Usually, men are much much tighter than women, so if there is a specific issue with a tight achilles, a bit of pre-skiing stretching prior to skiing will probably not hurt you, IF, as you said, you warm up first.
|Ok, I skipped the stretching this morning and just did a movement warmup. That means I did movements on dryland that more or less simulated what I would do on the slopes. No problems at all and thats with a bunch of super sticky snow and bumps in the mix.
At Epicski Academy, I did an On Snow warmup with my group. Next year, I will have to get it on tape, since it's hard to describe on a message forum. Basically, I did some exercises that involved holding your ski poles with both hands and planting them in the snow. Then, you round and flatten your lower back. Some people with back problems said that this was the first time that their back did not bother them while skiing.
I'll be teaching this in late August when I teach my ski fitness week in Portillo. Maybe I can get someone to take a video!