While the majority of the preserves are open, ACRES members also protect land that is not open to the public.
Most closed preserves are life estates, where a land donor lives and retains land use rights. Some preserves are closed to protect sensitive areas or natural features, or because trail installation is not possible.
Allen County
| Name | Acreage |
|---|
| Cedar Creek Bottoms Nature Preserve | 36 |
| Cedar Creek Nature Preserve | 58.147 |
| Chuck and Sharon Bodenhafer | 7.595 |
| D and J Eel River | 21.5 |
| Dorothy and Ray Garman Nature Preserve | 83.737 |
| Ellenwood Nature Preserve | 4.258 |
| Emanuel M. Popp Nature Preserve | 40 |
| Emilian Woods | 11.482 |
| Founders Forest | 58.835 |
| James M. & Patricia D. Barrett Nature Preserve | 87 |
| Jessie’s Woods Nature Preserve | 30 |
| Little Cedar Creek Wildlife Sanctuary Nature Preserve | 19 |
| Mackel Nature Preserve | 28.375 |
| Maumee River Overlook | 0.9 |
| Mills-Black Nature Preserve | 11.16 |
| Orion Woods | 30 |
| Raymond and Mildred Wetter Nature Preserve | 40 |
| Shure Acre | 1.085 |
Blackford County
| Name | Acreage |
|---|
| Kenneth Goble Nature Preserve | 97.64 |
DeKalb County
| Name | Acreage |
|---|
| Claxton Woods | 93.03 |
| James M. & Patricia D. Barrett Oak Hill Nature Preserve | 140.37 |
| Sliger Protected Land | 17.64 |
Elkhart County
| Name | Acreage |
|---|
| Caprarotta Family Natural Area | 29.38 |
| Eby Bog | 10.2 |
Fulton County
| Name | Acreage |
|---|
| Steve Richie | 36.45 |
Huntington County
| Name | Acreage |
|---|
| Doerman Nature Preserve | 37.594 |
| Little River Landing | 53.29 |
Kosciusko County
Lagrange County
| Name | Acreage |
|---|
| Draper | 31.7 |
| Indian River Nature Preserve | 29.2 |
| Martin Lake Nature Preserve | 5 |
| Quog Lake | 125.74 |
| Raber | 32.33 |
Miami County
| Name | Acreage |
|---|
| Walter H. and E. Marie Myers Nature Preserve on Flowers Creek | 157.41 |
Noble County
| Name | Acreage |
|---|
| Clock Creek | 34.991 |
| Kate M. Raber and James R. Johnson | 61.568 |
| Nevin Nature Preserve | 99.32 |
| Sauga Swamp | 67.89 |
| Tamarack Nature Preserve | 9.786 |
Paulding County
| Name | Acreage |
|---|
| Dunakin Woods | 26.036 |
St. Joseph
Steuben County
Wells County
| Name | Acreage |
|---|
| Hurb and Francis Fuller Woods | 55.58 |
| Peace Farm Nature Preserve | 24.19 |
Whitley County
| Name | Acreage |
|---|
| Kessler Nature Preserve | 1.331 |
| Richey Woods Nature Preserve | 134.718 |
