untested, but this should dod the trick:
<?php
$showSeasonal = 0;
do {
if($row_WADAproducts['ProductSeasonal'] == "1") {
$showSeasonal = "1";
break;
}
} while ($row_WADAproducts = mysql_fetch_assoc($WADAproducts));
mysql_data_seek($WADAproducts, 0);
$row_WADAproducts = mysql_fetch_assoc($WADAproducts);
?>
<?php if($showSeasonal == "1") { ?>
<Seasonal Div here>
<?php } ?>