Due to significant frost heave during the winter, rolling newly seeded fields will be critical this spring to lessen to chance of winter damage from the plants being raised within the soil profile.
Bottom line, if the field is wet (ie – you can hear and or see water on the turf) DO NOT roll the field. I drove by a field this morning that had standing water in the outfield and it was being rolled with a 1 1/2 ton roller. Rolling a field when completely saturated has a great chance of causing serious compaction issues.
HERE is a great article about rolling athletic fields from Buckeye Turf notes from Ohio State.