On average the entire process of mowing, raking and baling hay takes 3 days—in good weather. Therefore, pastures should be cut when a window of at least 3 days of sunny, dry, hot weather can be expected. Some farmers cut on the last day of a rainy spell in order to maximize the number of hours of drying time.

How late can you cut hay?

The answers to these questions are usually something like… "it is fine to harvest through the first week of September", and… "we recommend harvesting at least six weeks before the killing frost." On average, the alfalfa killing frost (24 to 25 degrees F) in northeast Iowa occurs in the third to fourth week of October.

How do you know when your hay is ready to cut?

The first cutting in the spring should be when grass has greened up and reached 12 – 16 inches tall. This should clean up all the old growth of winter weeds and such. Then each subsequent cutting is at 3.5 to 5 week intervals. This is dependent on fertilizer and moisture.