Welcome sheepless!
where are you in iowa? we have a couple members, tedh and LazyBkpr in iowa also.
maples and willows for me are the first pollen, but we are still a little from that, won't be long. weather has been crazy, very cold temps, a warm up the past weekend in the 60's, 70 something yesterday, and now we are right back to 30's again.
i wouldn't remove the insulation just yet, not until temps are more stable, and well above freezing. i don't usually remove my wraps until late march or april, weather dependent, we can still get some crazy cold snaps and blustering winds in march. when to remove the sugar candy?
i wouldn't remove it until temps are good enough for you to feed syrup (if necessary), or wouldn't remove it if they don't have ample stores in the hive to survive without some feed on or feed present in the hive. hope this makes sense?
again, WELCOME!