A Map to get you to Grimes Farm:

If you are coming from the west (from Des Moines, Ames, Denver,
San Francisco, Tokyo, etc.) take Exit 181 from Highway 30. Turn
left at Highland Acres Road and head north for about half a mile.
Turn left again on 233rd Street. Grimes Farm will be on your right.
If you are coming from the east (from Le Grand, Cedar Rapids, Iowa
City, Chicago, Boston, Paris, etc.) take Exit 182 (Highland Acres
Road) and turn right. The road will make a peculiar little jog as
it goes over Iowa Avenue, but keep on going north for another half
a mile or so. Turn left on 233rd Street. Grimes Farm will be on
your right.
Note that there really are no opening and closing times, and there
is no charge for admission. Also, be aware that there are few facilitiesjust
wonderful trails for walking and birding and admiring the landscape.