Asked this in lawn care with only 1 response [thanks FIREMAN] so... I filled a low area [500 cu.yds]and seeded, now heavy rains show a few low spots, largest is 3-5' x 6-8' x 4-6" deep. Grass has come in great and even with standing water in low spots for 1.5-2 days until it drained looks good. I'm north of Seattle where grass can grow all year and this is a play/soccer field so I want it established over the winter. Question: Should I completely fill low spots with sand/topsoil now, reseed and hope for germination, or Partially fill with sand/topsoil, let grow through for a while, then do it again, repeat until level, or Wait til late spring [when I can drive on it again] completely fill and level then re-seed or try to match with sod? Thanks for suggestions, Will M.