ABERDEEN, S.D. (WNAX) – With the September forecasts trending cooler than normal, there is growing concern about an early frost.

South Dakota State Climatologist Laura Edwards says there are no signs of an unseasonable freeze.

Edwards says all the moisture over the past 18 months could help protect against an early frost.

The normal frost date ranges from late September to late October from north to south across the northern plains.