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The attached picture shows the Rapid City Regional Airport, KRAP. If I arrive after KRAP's tower is closed, which frequency should I use: 125.85 or 122.95?

Sectional Snippet

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You use the CTAF for announcing your position and intentions, i.e. 125.85. From the AIM 4-1-9(g):

If an airport has a tower and it is temporarily closed, or operated on a part-time basis and there is no FSS on the airport or the FSS is closed, use the CTAF to self-announce your position or intentions.

4-1-9(b) says:

The CTAF may be a UNICOM, MULTICOM, FSS, or tower frequency and is identified in appropriate aeronautical publications.

125.85 is marked as the CTAF on the sectional and listed in the Chart Supplement.

Note: The letter "C" in the dark circle next to the control tower ("CT") frequency indicates that the CT frequency is the CTAF frequency at that airport.

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    $\begingroup$ Understood, and I know the CTAF is 125.85 because the blue-circled C is next to 125.85, right? If the blue-circled C was next to 122.95, CTAF would be that frequency? $\endgroup$
    – Garrison Neely
    Jun 26, 2017 at 20:55
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    $\begingroup$ @GarrisonNeely Yes, the C indicates the CTAF frequency. You can check the VFR chart legend for a full breakdown of all the information shown there. $\endgroup$
    – Pondlife
    Jun 26, 2017 at 21:02

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