diff --git a/bld/namelist_files/namelist_defaults_ctsm.xml b/bld/namelist_files/namelist_defaults_ctsm.xml
index bea8f56427..a1229c2175 100644
--- a/bld/namelist_files/namelist_defaults_ctsm.xml
+++ b/bld/namelist_files/namelist_defaults_ctsm.xml
@@ -486,9 +486,9 @@ attributes from the config_cache.xml file (with keys converted to upper-case).
 <!-- The default filenames are given relative to the root directory
      for the CLM2 data in the CESM distribution -->
 <!-- Plant function types (relative to {csmdata}) -->
-<paramfile phys="clm5_1" >/glade/campaign/cgd/tss/people/oleson/modify_param/ctsm51_params.c240201.nc</paramfile>
-<paramfile phys="clm5_0" >lnd/clm2/paramdata/clm50_params.c240105.nc</paramfile>
-<paramfile phys="clm4_5" >lnd/clm2/paramdata/clm45_params.c240105.nc</paramfile>
+<paramfile phys="clm5_1" >/glade/campaign/cgd/tss/people/oleson/modify_param/ctsm51_params.c240208.nc</paramfile>
+<paramfile phys="clm5_0" >/glade/campaign/cgd/tss/people/oleson/modify_param/clm50_params.c240208.nc</paramfile>
+<paramfile phys="clm4_5" >/glade/campaign/cgd/tss/people/oleson/modify_param/clm45_params.c240208.nc</paramfile>
 
 <!-- ================================================================== -->
 <!-- FATES default parameter file                                       -->
diff --git a/cime_config/testdefs/testmods_dirs/clm/ciso_cwd_hr/user_nl_clm b/cime_config/testdefs/testmods_dirs/clm/ciso_cwd_hr/user_nl_clm
index 4e073859be..2b8f437246 100644
--- a/cime_config/testdefs/testmods_dirs/clm/ciso_cwd_hr/user_nl_clm
+++ b/cime_config/testdefs/testmods_dirs/clm/ciso_cwd_hr/user_nl_clm
@@ -1,2 +1,2 @@
-paramfile = '$DIN_LOC_ROOT/lnd/clm2/paramdata/ctsm51_ciso_cwd_hr_params.c240105.nc'
+paramfile = '/glade/campaign/cgd/tss/people/oleson/modify_param/ctsm51_ciso_cwd_hr_params.c240208.nc'
 hist_fincl1 = 'CWDC_HR','C13_CWDC_HR','C14_CWDC_HR','CWD_HR_L2','CWD_HR_L2_vr','CWD_HR_L3','CWD_HR_L3_vr'
diff --git a/src/biogeochem/CNPhenologyMod.F90 b/src/biogeochem/CNPhenologyMod.F90
index 05041527a7..fffb19bc46 100644
--- a/src/biogeochem/CNPhenologyMod.F90
+++ b/src/biogeochem/CNPhenologyMod.F90
@@ -97,6 +97,7 @@ module CNPhenologyMod
      real(r8) :: soilpsi_off           ! critical soil water potential for leaf offset
      real(r8) :: lwtop                 ! live wood turnover proportion (annual fraction)
      real(r8) :: phenology_soil_depth  ! soil depth used for measuring states for phenology triggers
+     real(r8) :: snow5d_thresh_for_onset ! 5-day snow depth threshold for leaf onset
   end type params_type
 
   type(params_type) :: params_inst
@@ -280,6 +281,7 @@ subroutine CNPhenologySetParams( )
     params_inst%soilpsi_off           = -0.8          ! MPa
     params_inst%lwtop                 = 0.7_r8        ! Fraction
     params_inst%phenology_soil_depth  = 0.08_r8       ! m
+    params_inst%snow5d_thresh_for_onset = 0.2_r8      ! m
   end subroutine CNPhenologySetParams
   
   !-----------------------------------------------------------------------
@@ -313,6 +315,7 @@ subroutine readParams ( ncid )
     call readNcdioScalar(ncid, 'soilpsi_off', subname, params_inst%soilpsi_off)
     call readNcdioScalar(ncid, 'lwtop_ann', subname, params_inst%lwtop)
     call readNcdioScalar(ncid, 'phenology_soil_depth', subname, params_inst%phenology_soil_depth)
+    call readNcdioScalar(ncid, 'snow5d_thresh_for_onset', subname, params_inst%snow5d_thresh_for_onset)
     
 
   end subroutine readParams
@@ -1136,7 +1139,6 @@ function SeasonalDecidOnset( onset_gdd, onset_gddflag, soilt, soila10, t_a5min,
     logical :: do_onset                       ! Flag if onset should happen (return value)
     !
     ! !LOCAL VARIABLES:
-    real(r8), parameter :: snow5d_thresh_for_onset      = 0.1_r8          ! 5-day snow depth threshold for leaf onset
     real(r8), parameter :: min_critical_daylength_onset = 39300._r8/2._r8 ! Minimum daylength for onset to happen
                                                                           ! NOTE above: The 39300/2(19650) value is what we've
                                                                           ! tested with, we are concerned that changing 
@@ -1192,7 +1194,8 @@ function SeasonalDecidOnset( onset_gdd, onset_gddflag, soilt, soila10, t_a5min,
         else if (season_decid_temperate == 0 .and.  onset_gddflag == 1.0_r8 .and. &
                 soila10 > SHR_CONST_TKFRZ .and. &
                 t_a5min > SHR_CONST_TKFRZ .and. ws_flag==1.0_r8 .and. &
-                dayl>min_critical_daylength_onset .and.  snow_5day<snow5d_thresh_for_onset) then
+                dayl>min_critical_daylength_onset .and. &
+                snow_5day<params_inst%snow5d_thresh_for_onset) then
            do_onset = .true.
         end if
     else