you want to keep the weather in mind and where you step when trapping golf courses late in winter, too. even if the grass looks "green" you can kill it if there was a frost by simply walking across a green to get to the rat pond. thats why carts aren't allowed after a certain time of year on courses located in colder regions. i've seen this effect on lawns, even. someone walks across a lawn after a hard freeze early, and there will literally be "black" footprints across that lawn where each step killed the grass.
i'm sure that if you have permission to trap that course that they have gone over all those concerns with you ahead of time, but just in case they didn't I thought I would pass this along from my experience with manicured, golf course greens.