Normally when the recommendation to plant a cool season plant shows an Oct. 1st date, the reason is to get the plant past the late hot season temperatures. Your area can experience 100 degree temperatures the last week in September. Years ago my dad took the last week of Sept off to build fence. Every day was over 100 degrees.

However, this year fall seems to have come early. The 10 day forecast only shows a day or two with temperatures at 91 degrees. The summer temperatures seems to have broken. I would go ahead and plant early this year due to the forecast showing no hot temperatures. I planted lettuce last week due to the relatively mild temperatures.