Reprint on USGA Frost Delay information.
Our target number is 39º in most cases before the frost has melted off of the shaded bentgrass. #1 will stay shaded until 10:00 so the temperature becomes critical so we don’t harm the green. We will water the greens when the temperatures are 37. If we water too early we form ice rinks and it takes longer to thaw ice than frost.
Mark Novotny CGCS