diff --git a/cime_config/buildnml b/cime_config/buildnml
index e06b9388c7..6215379912 100644
--- a/cime_config/buildnml
+++ b/cime_config/buildnml
@@ -23,7 +23,7 @@ _config_cache_template = """
 <?xml version="1.0"?>
 <config_definition>
 <commandline></commandline>
-<entry id="phys" value="{clm_phys}" list="" valid_values="clm4_5,clm5_0,clm5_1,clm6_0">Specifies CTSM physics</entry>
+<entry id="phys" value="{clm_phys}" list="" valid_values="clm4_5,clm5_0,clm6_0">Specifies CTSM physics</entry>
 </config_definition>
 """
 
@@ -105,11 +105,6 @@ def buildnml(case, caseroot, compname):
         "clm5_0_QIAN": "clm5_0_GSWP3v1",
         "clm5_0_NLDAS2": "clm5_0_GSWP3v1",
         "clm5_0_ERA5": "clm5_0_GSWP3v1",
-        "clm5_1_1PT": "clm5_1_GSWP3v1",
-        "clm5_1_QIAN": "clm5_1_GSWP3v1",
-        "clm5_1_NLDAS2": "clm5_1_GSWP3v1",
-        "clm5_1_ERA5": "clm5_1_GSWP3v1",
-        "clm5_1_CRUv7": "clm5_1_GSWP3v1",
         "clm6_0_1PT": "clm6_0_GSWP3v1",
         "clm6_0_QIAN": "clm6_0_GSWP3v1",
         "clm6_0_NLDAS2": "clm6_0_GSWP3v1",
@@ -136,13 +131,9 @@ def buildnml(case, caseroot, compname):
     #  to the CAM version)
     tuning_based_on = {
         "clm6_0_GSWP3v1": "clm5_0_GSWP3v1",
-        "clm5_1_GSWP3v1": "clm5_0_GSWP3v1",
         "clm6_0_cam6.0": "clm5_0_cam6.0",
         "clm6_0_cam5.0": "clm5_0_cam6.0",
         "clm6_0_cam4.0": "clm5_0_cam6.0",
-        "clm5_1_cam6.0": "clm5_0_cam6.0",
-        "clm5_1_cam5.0": "clm5_0_cam6.0",
-        "clm5_1_cam4.0": "clm5_0_cam6.0",
         "clm5_0_cam5.0": "clm5_0_cam6.0",
         "clm5_0_cam4.0": "clm5_0_cam6.0",
         "clm4_5_cam6.0": "clm5_0_cam6.0",
diff --git a/cime_config/config_component.xml b/cime_config/config_component.xml
index 56ed65c5ce..2506b8954a 100644
--- a/cime_config/config_component.xml
+++ b/cime_config/config_component.xml
@@ -15,7 +15,6 @@
   <description modifier_mode="1">
     <desc lnd="CLM45[%SP][%SP-VIC][%BGC][%BGC-CROP][%FATES][%BGCDV][%BGCDV-CROP]"                  >clm4.5:</desc>
     <desc lnd="CLM50[%SP][%SP-VIC][%SP-NOANTHRO][%BGC-NOANTHRO][%BGC][%BGC-CROP][%FATES][%BGCDV][%BGCDV-CROP][%BGC-CROP-CMIP6DECK][%BGC-CROP-CMIP6WACCMDECK][%NWP-SP][%NWP-BGC-CROP]">clm5.0:</desc>
-    <desc lnd="CLM51[%SP][%SP-NOANTHRO][%BGC-NOANTHRO][%BGC][%BGC-CROP][%FATES][%FATES-SP][%FATES-NOCOMP][%NWP-SP][%NWP-BGC-CROP]">clm5.1:</desc>
     <desc lnd="CLM60[%SP][%SP-NOANTHRO][%BGC-NOANTHRO][%BGC][%BGC-CROP][%FATES][%FATES-SP][%FATES-NOCOMP][%BGC-CROP-CMIP6DECK][%BGC-CROP-CMIP6WACCMDECK][%NWP-SP][%NWP-BGC-CROP]">clm6.0:</desc>
     <desc option="SP"              >Satellite phenology:</desc>
 
@@ -79,7 +78,7 @@
     </desc>
     <default_value>UNSET</default_value>
     <!-- 10 forcing options for each CLM physics option: CRUv7, GSWP3, cam7.0, cam6.0, cam5.0, cam4.0, QIAN, 1PT, NLDAS2, ERA5 -->
-    <valid_values>clm5_0_cam6.0,clm5_0_cam7.0,clm5_0_cam5.0,clm5_0_cam4.0,clm5_0_GSWP3v1,clm5_0_CRUv7,clm5_0_QIAN,clm5_0_1PT,clm5_0_NLDAS2,clm5_0_ERA5,clm4_5_CRUv7,clm4_5_GSWP3v1,clm4_5_QIAN,clm4_5_cam6.0,clm4_5_cam7.0,clm4_5_cam5.0,clm4_5_cam4.0,clm4_5_1PT,clm4_5_NLDAS2,clm4_5_ERA5,clm5_1_CRUv7,clm5_1_GSWP3v1,clm5_1_cam6.0,clm5_1_QIAN,clm5_1_1PT,clm5_1_NLDAS2,clm5_1_ERA5,clm6_0_CRUv7,clm6_0_GSWP3v1,clm6_0_cam6.0,clm6_0_cam7.0,clm6_0_cam5.0,clm6_0_cam4.0,clm6_0_QIAN,clm6_0_1PT,clm6_0_NLDAS2,clm6_0_ERA5</valid_values>
+    <valid_values>clm5_0_cam6.0,clm5_0_cam7.0,clm5_0_cam5.0,clm5_0_cam4.0,clm5_0_GSWP3v1,clm5_0_CRUv7,clm5_0_QIAN,clm5_0_1PT,clm5_0_NLDAS2,clm5_0_ERA5,clm4_5_CRUv7,clm4_5_GSWP3v1,clm4_5_QIAN,clm4_5_cam6.0,clm4_5_cam7.0,clm4_5_cam5.0,clm4_5_cam4.0,clm4_5_1PT,clm4_5_NLDAS2,clm4_5_ERA5,clm6_0_CRUv7,clm6_0_GSWP3v1,clm6_0_cam6.0,clm6_0_cam7.0,clm6_0_cam5.0,clm6_0_cam4.0,clm6_0_QIAN,clm6_0_1PT,clm6_0_NLDAS2,clm6_0_ERA5</valid_values>
     <values match="last">
       <!-- Options for atm forcing are: CRU, CRUv7, GSWP3, cam6.0 (also used for DATM%CPLHIST), cam5.0, cam4.0, QIAN, WISOQIA, 1PT, NLDAS2, and ERA5) -->
       <!-- All the clm4_5 physics options -->
@@ -114,14 +113,6 @@
       <value compset="DATM%1PT_CLM50"    >clm5_0_1PT</value>
       <value compset="DATM%NLDAS2_CLM50" >clm5_0_NLDAS2</value>
       <value compset="DATM%ERA5_CLM50"   >clm5_0_ERA5</value>
-      <!-- All the clm5_1 physics options -->
-      <value compset="DATM%GSWP3v1_CLM51">clm5_1_GSWP3v1</value>
-      <value compset="CAM[^_]*_CLM51"    >INVALID_USE_CLM60_NOT_CLM51</value>
-      <value compset="CAM40[^_]*_CLM51"  >clm5_1_cam4.0</value>
-      <value compset="CAM50[^_]*_CLM51"  >clm5_1_cam5.0</value>
-      <value compset="CAM60[^_]*_CLM51"  >clm5_1_cam6.0</value>
-      <value compset="CAM70[^_]*_CLM51"  >INVALID_USE_CLM60_NOT_CLM51_FOR_CAM70</value>
-      <value compset="DATM%CPLHIST_CLM51">INVALID_USE_CLM60_NOT_CLM51_FOR_CPLHIST</value>
       <!-- All the clm6_0 physics options -->
       <value compset="DATM%CRUv7_CLM60"  >clm6_0_CRUv7</value>
       <value compset="DATM%CRU_CLM60"    >clm6_0_CRUv7</value>
@@ -148,7 +139,7 @@
 
   <entry id="CLM_PHYSICS_VERSION" >
     <type>char</type>
-    <valid_values>clm4_5,clm5_0,clm5_1,clm6_0</valid_values>
+    <valid_values>clm4_5,clm5_0,clm6_0</valid_values>
     <!-- By setting the default_value to UNSET (or some other non-empty
          string that doesn't appear in the list of valid_values), the
          scripts will ensure that one of the below values is picked up
@@ -157,7 +148,6 @@
     <values>
       <value compset="_CLM45" >clm4_5</value>
       <value compset="_CLM50" >clm5_0</value>
-      <value compset="_CLM51" >clm5_1</value>
       <value compset="_CLM60" >clm6_0</value>
     </values>
     <group>run_component_ctsm</group>
@@ -367,10 +357,7 @@
     <values match="last">
       <value                  compset="_CLM60%[^_]*FATES-SP[%_]"    >$COMP_ROOT_DIR_LND/cime_config/usermods_dirs/fates_sp</value>
       <value                  compset="_CLM60%[^_]*FATES-NOCOMP[%_]">$COMP_ROOT_DIR_LND/cime_config/usermods_dirs/fates_nocomp</value>
-      <value                  compset="_CLM51%[^_]*FATES-SP[%_]"    >$COMP_ROOT_DIR_LND/cime_config/usermods_dirs/fates_sp</value>
       <value                  compset="_CLM50%[^_]*CMIP6DECK[%_]"   >$COMP_ROOT_DIR_LND/cime_config/usermods_dirs/cmip6_deck</value>
-      <value                  compset="_CLM51%[^_]*FATES-SP[%_]"    >$COMP_ROOT_DIR_LND/cime_config/usermods_dirs/fates_sp</value>
-      <value                  compset="_CLM51%[^_]*FATES-NOCOMP[%_]">$COMP_ROOT_DIR_LND/cime_config/usermods_dirs/fates_nocomp</value>
       <value grid="l%1.9x2.5" compset="_CLM50%[^_]*CMIP6DECK[%_]"   >$COMP_ROOT_DIR_LND/cime_config/usermods_dirs/cmip6_nociso_deck</value>
       <value                  compset="_CLM50%[^_]*CMIP6WACCMDECK[%_]">$COMP_ROOT_DIR_LND/cime_config/usermods_dirs/cmip6_waccm_deck</value>
       <value grid="l%1.9x2.5" compset="_CLM50%[^_]*CMIP6WACCMDECK[%_]">$COMP_ROOT_DIR_LND/cime_config/usermods_dirs/cmip6_waccm_nociso_deck</value>
diff --git a/cime_config/config_compsets.xml b/cime_config/config_compsets.xml
index e5d716384a..8ab6254029 100644
--- a/cime_config/config_compsets.xml
+++ b/cime_config/config_compsets.xml
@@ -14,7 +14,7 @@
     Where for the CAM specific compsets below the following is supported
     TIME = Time period (e.g. 2000, HIST, SSP585...)
     ATM  = [CAM40, CAM50, CAM60]
-    LND  = [CLM45, CLM50, CLM51, CLM60, SLND]
+    LND  = [CLM45, CLM50, CLM60, SLND]
     ICE  = [CICE, DICE, SICE]
     OCN  = [DOCN, ,AQUAP, SOCN]
     ROF  = [RTM, SROF]
@@ -344,12 +344,6 @@
     <science_support grid="f19_g17"/>
   </compset>
 
-  <!-- Needed for testing until CAM removes used of CLM51 in compsets-->
-  <compset>
-    <alias>IHistClm51Sp</alias>
-    <lname>HIST_DATM%GSWP3v1_CLM51%SP_SICE_SOCN_MOSART_SGLC_SWAV</lname>
-  </compset>
-
   <compset>
     <alias>IHistClm60SpRs</alias>
     <lname>HIST_DATM%GSWP3v1_CLM60%SP_SICE_SOCN_SROF_SGLC_SWAV</lname>
@@ -407,7 +401,7 @@
     <lname>HIST_DATM%QIA_CLM60%BGC_SICE_SOCN_SROF_SGLC_SWAV</lname>
   </compset>
 
-<!-- 
+<!--
      future scenario compsets
 -->
   <compset>
@@ -610,7 +604,7 @@
     <lname>2000_DATM%CRUv7_CLM45%SP-VIC_SICE_SOCN_RTM_SGLC_SWAV</lname>
   </compset>
 
-<!-- 
+<!--
      IG compsets with active Glacier model
 -->
 
@@ -660,12 +654,6 @@
     <science_support grid="f19_g17"/>
     <science_support grid="ne30pg3_t232"/>
   </compset>
-  <!-- Needed for testing until removed by CESM -->
-  <compset>
-    <alias>I1850Clm51BgcCropG</alias>
-    <lname>1850_DATM%GSWP3v1_CLM51%BGC-CROP_SICE_SOCN_MOSART_CISM2%GRIS-EVOLVE_SWAV</lname>
-  </compset>
-
 
   <!-- Primarily for testing: same as I1850Clm50SpGag but with SROF -->
   <compset>