To your own lawn? If so certainly your choice.
If you are doing that for customers, not so wise. Heck next week here is all in the 80's and nearly every year is at least in the 60's for highs with POSSIBLE frost although frost date usually closer to Oct 10 or so. We are talking light frost, not freeze, which comes closer to Halloween.
These companies just want to push the envelope because they have way too many to do. Also, no one installed irrigation systems this season due to good rainfall, so they probably want SOMETHING to do as well lol.