Tidal wetlands including mangroves, saltmarsh and supratidal forests are important ecosystems for mitigating the effects of climate change and sea level rise (SLR). But tidal wetlands are also vulnerable to increased loss with increasing rates of SLR. The Rod Surface Elevation Table Marker Horizon (RSET-MH) method is used globally to assess trends in surface elevation change relative to SLR in tidal wetlands. Western Australia (WA) is highly vulnerable to tidal wetland loss due to decreasing annual precipitation and high relative rates of SLR, yet minimal research has been done on the vulnerability of tidal wetlands to SLR in WA. In this study, we installed 24 RSET-MH stations across a range of geomorphic settings to provide the first trends of surface elevation change in tidal wetlands relative to SLR in south-west WA. Trends in surface elevation ranged from -3.56 mm/yr in a tidally disconnected paddock to + 3.1 mm/yr in a riverine wetland. While all sites have shown positive trends in surface elevation change and sediment accretion. All sites also show elevation deficits relative to local SLR trends. This research is a first step in filling an important gap in our knowledge of tidal wetlands vulnerability to SLR in south-west WA.