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Upcoming Events


Early to mid-April, East Lake Park, Osceola — Free Prescribed Burn Workshop. Date and time to be announced depending on weather. Email if you are interested in participating.

Family friendly, out-in-nature stroll from the South Shelter to Clark Tower and back.
April 22, 11:30 AM:FLS! is hosting the 2nd annual public “Walk in the Park” at Winterset City Park. Celebrate Earth Day by enjoying spring wildflowers with knowledgeable plant people as we stroll through the treasure that is Winterset City Park. Shelter is ours at 11:30.  Picnic before, pick up resources, get acquainted. Walk begins at 12:30 PM. Bring water, dress for the weather, and prepare to enjoy!

Saturday, May 5: Spring Nature Walk, Springer Woods, Decatur County — SIOSA members will lead a walk through the 40-acre woodland to observe wildflowers, birds, insects and other wildlife.

Saturday, June 23, 8:00 AM: Prairie Walk at Bobwhite State Park, Wayne County — Walk the Prairie Trail and learn about prairie wildlife and restoration work that has been done.

Sunday, July 22, 9:00 AM – 12 noon at Slip Bluff County Park, Decatur County — Monarch and Milkweed Monitoring. Monitoring for Monarchs, milkweeds and nectar plants was done at Slip Bluff County Park at three areas of the park in 2016 and one area of the park in 2017. In 2018, monitoring using the Monarch Larval Monitoring Project protocol will continue with a field day for the public to learn about the monitoring and participate. Monarch density and milkweed density studies will be done on the east side of the lake and possibly in the East Oak Savanna area. A list of flowering plants will also be made. Educational materials will be provided. Drinks and snacks will be provided. Email if you plan to participate.

Next SIOSA board meeting

The next regular SIOSA meeting is Wednesday, April 4 at 1:00 pm.  We will be meeting at the Clarke County Conservation Board headquarters at East Lake Park.  The park is located just east of Osceola on Hwy 34.


Welcome to the website of The Southern Iowa Oak Savanna Alliance (SIOSA). We are a non profit organization involved in the preservation and conservation of Iowa’s oak savanna and prairie ecosystem.


New: Download the Decatur County Conservation Board Prescribed Fire Burn Plan Form to Help Plan Your Burn – Click Here