Problem passing Parameters using DAO QueryDef

I am trying to pass a start and end date to a parameter query using DAO querydef. Even though I assume I have passed the parameters in the following code, I am still being prompted to enter the dates. What am I missing?

'qryRpt_ByRelease
SELECT FROM tblProjectControl " _
& "tblProjectControl.TargetDT, " _
& "tblProjectControl.SomeField2, " _
& "tblProjectControl.SomeField3 " _ 
...
& "WHERE tblProjectControl.targetID " _
& ">=[StartDT] And <= [EndDT];"


Private Sub cmdBuildReleaseReport_Click()
'On Error GoTo Err_cmdBuildReleaseReport_Click
    
    Dim StartDT As Date
    Dim EndDT As Date
    StartDT = cboReleaseMonth.Column(2)
    EndDT = cboReleaseMonth.Column(3)

    Dim DB As DAO.Database
    Dim qdf As DAO.QueryDef
    Dim rs As DAO.Recordset
    Set DB = CurrentDb
    Set qdf = DB.QueryDefs("qryRpt_ByRelease")
    
    qdf.Parameters("StartDT") = StartDT
    qdf.Parameters("EndDT") = EndDT
    Set rs = qdf.OpenRecordset()
    With rs
        DoCmd.OpenQuery "qryRpt_ByRelease"
        .Close
    End With

End Sub

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