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OpenAug 13, 2026
Due by December 18, 2026
•Last updated This is the tag on the ctsm6.0 release-cesm3.0 branch (from release-ctsm6.0) that will be used in the actual CESM3.0.0 release given to the public.
Science MUST be ALL done at this point. Limited Bug fixes approved by the entire CESM project and CESM SSC is required for anything that changes answers.
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Update timing tables for land-only compsets
docs-loc:otherRelates to documentation somewhere not covered by the other docs-loc labels.Relates to documentation somewhere not covered by the other docs-loc labels.docs:updateSignificant update or fix needed to existing documentationSignificant update or fix needed to existing documentationdocumentationadditions or edits to user-facing documentation or its infrastructureadditions or edits to user-facing documentation or its infrastructuregood first issuesimple; good for first-time contributorssimple; good for first-time contributorstest: noneNo tests required (e.g. tools/contrib)No tests required (e.g. tools/contrib)Status: Open.#2722 In ESCOMP/CTSM;Make procedure for throughput testing of FATES runs
b4bbit-for-bitbit-for-bitblocked: dependencyWait to work on this until dependency is resolvedWait to work on this until dependency is resolvedblockeranother issue/PR depends on this oneanother issue/PR depends on this onedocs-loc:users-guideRelates to User's Guide (using CTSM/tools)Relates to User's Guide (using CTSM/tools)docs:newNew documentation needed (e.g., for a new feature)New documentation needed (e.g., for a new feature)documentationadditions or edits to user-facing documentation or its infrastructureadditions or edits to user-facing documentation or its infrastructureFATESA change needed for FATES that doesn't require a FATES API update.A change needed for FATES that doesn't require a FATES API update.Status: Open.#2745 In ESCOMP/CTSM;CTSM-FATES timing/cost
performanceidea or PR to improve performance (e.g. throughput, memory)idea or PR to improve performance (e.g. throughput, memory)Status: Open.#1076 In ESCOMP/CTSM;Create a non cold-start FATES test
blockeranother issue/PR depends on this oneanother issue/PR depends on this oneenhancementnew capability or improved behavior of existing capabilitynew capability or improved behavior of existing capabilityFATESA change needed for FATES that doesn't require a FATES API update.A change needed for FATES that doesn't require a FATES API update.testingadditions or changes to testsadditions or changes to testsStatus: Open.User's Guide: cprnc documentation needs updating
docs-loc:users-guideRelates to User's Guide (using CTSM/tools)Relates to User's Guide (using CTSM/tools)docs:minor-tech-fixMinor technical fix needed to documentation content (e.g. broken link, broken rendering)Minor technical fix needed to documentation content (e.g. broken link, broken rendering)docs:updateSignificant update or fix needed to existing documentationSignificant update or fix needed to existing documentationdocumentationadditions or edits to user-facing documentation or its infrastructureadditions or edits to user-facing documentation or its infrastructureStatus: Open.#2753 In ESCOMP/CTSM;run_tower --ad flag not working correctly
bugsomething is working incorrectlysomething is working incorrectlyinvestigationNeeds to be verified and more investigation into what's going on.Needs to be verified and more investigation into what's going on.single pointissues with supported tower sitesissues with supported tower sitesStatus: Open.PRISM data for NEON towers only runs through 2022
enhancementnew capability or improved behavior of existing capabilitynew capability or improved behavior of existing capabilitypriority: lowBackground task that doesn't need to be done right away.Background task that doesn't need to be done right away.single pointissues with supported tower sitesissues with supported tower sitessupportuser or developer needs helpuser or developer needs helpStatus: Open.PCT_URBAN=0 at 0° longitude using 0°-360° longitude mesh but works using -180-180 longitude mesh
bugsomething is working incorrectlysomething is working incorrectlydocumentationadditions or edits to user-facing documentation or its infrastructureadditions or edits to user-facing documentation or its infrastructureStatus: Open.#3141 In ESCOMP/CTSM;rest_flag is allowed in build-namelist, but not in the FORTRAN namelist
b4bbit-for-bitbit-for-bitbugsomething is working incorrectlysomething is working incorrectlypriority: lowBackground task that doesn't need to be done right away.Background task that doesn't need to be done right away.usabilityImprove or clarify user-facing optionsImprove or clarify user-facing optionsStatus: Open.Remove BFBFLAG from our testing
b4bbit-for-bitbit-for-bitpriority: lowBackground task that doesn't need to be done right away.Background task that doesn't need to be done right away.testingadditions or changes to testsadditions or changes to testsusabilityImprove or clarify user-facing optionsImprove or clarify user-facing optionsStatus: Open.User's Guide: Force h2i in GDD-Generating workflow
blocked: dependencyWait to work on this until dependency is resolvedWait to work on this until dependency is resolveddocs-loc:users-guideRelates to User's Guide (using CTSM/tools)Relates to User's Guide (using CTSM/tools)docs:minor-content-fixSmall fix needed to (or improvement suggested in) documentation contentSmall fix needed to (or improvement suggested in) documentation contentdocumentationadditions or edits to user-facing documentation or its infrastructureadditions or edits to user-facing documentation or its infrastructureStatus: Open.#3323 In ESCOMP/CTSM;User's Guide: Update instructions for generating crop maturity reqts
docs-loc:users-guideRelates to User's Guide (using CTSM/tools)Relates to User's Guide (using CTSM/tools)docs:updateSignificant update or fix needed to existing documentationSignificant update or fix needed to existing documentationdocumentationadditions or edits to user-facing documentation or its infrastructureadditions or edits to user-facing documentation or its infrastructureStatus: Open.#3332 In ESCOMP/CTSM;Long-term investigation into why interpolation between grids fails spinup stability checks
bugsomething is working incorrectlysomething is working incorrectlyinvestigationNeeds to be verified and more investigation into what's going on.Needs to be verified and more investigation into what's going on.scienceEnhancement to or bug impacting scienceEnhancement to or bug impacting scienceStatus: Open.Setup ndep, aerosols, and CO2 for CRUJRA -- the gap year between 2014-2023
enhancementnew capability or improved behavior of existing capabilitynew capability or improved behavior of existing capabilityexternalissue needs to be addressed elsewhere (submodule); issue here for the sake of project trackingissue needs to be addressed elsewhere (submodule); issue here for the sake of project trackingnon-b4bChanges answers (incl. adding tests)Changes answers (incl. adding tests)scienceEnhancement to or bug impacting scienceEnhancement to or bug impacting scienceusabilityImprove or clarify user-facing optionsImprove or clarify user-facing optionsStatus: Open.Make Python tools work in CESM checkout
enhancementnew capability or improved behavior of existing capabilitynew capability or improved behavior of existing capabilitytestingadditions or changes to testsadditions or changes to testsStatus: Open.Consider linking our zenodo DOI to the NSF NCAR community
b4bbit-for-bitbit-for-bitenhancementnew capability or improved behavior of existing capabilitynew capability or improved behavior of existing capabilityexternalissue needs to be addressed elsewhere (submodule); issue here for the sake of project trackingissue needs to be addressed elsewhere (submodule); issue here for the sake of project trackinginvestigationNeeds to be verified and more investigation into what's going on.Needs to be verified and more investigation into what's going on.priority: lowBackground task that doesn't need to be done right away.Background task that doesn't need to be done right away.Status: Open.SMINN_TO_PLANT_FUN units incorrect in history
b4bbit-for-bitbit-for-bitbugsomething is working incorrectlysomething is working incorrectlyStatus: Open.#2263 In ESCOMP/CTSM;Add tests to test suite to run run_tower
enhancementnew capability or improved behavior of existing capabilitynew capability or improved behavior of existing capabilitytestingadditions or changes to testsadditions or changes to testsStatus: Open.Build-namelist logic to find the finidat file is fragile and needs to be redone
b4bbit-for-bitbit-for-bitcode healthimproving internal code structure to make easier to maintain (sustainability)improving internal code structure to make easier to maintain (sustainability)enhancementnew capability or improved behavior of existing capabilitynew capability or improved behavior of existing capabilitypriority: highHigh priority to fix/merge soon, e.g., because it is a problem in important configurationsHigh priority to fix/merge soon, e.g., because it is a problem in important configurationsStatus: Open.#2169 In ESCOMP/CTSM;List of testing changes to make
code healthimproving internal code structure to make easier to maintain (sustainability)improving internal code structure to make easier to maintain (sustainability)enhancementnew capability or improved behavior of existing capabilitynew capability or improved behavior of existing capabilitytestingadditions or changes to testsadditions or changes to testsStatus: Open.Create a script to create custom parameter files needed for our testmods to reduce maintence
test: aux_clmPass aux_clm suite before mergingPass aux_clm suite before mergingtestingadditions or changes to testsadditions or changes to testsStatus: Open.#3034 In ESCOMP/CTSM;Add a checker for the testlist to verify that the tests make sense
enhancementnew capability or improved behavior of existing capabilitynew capability or improved behavior of existing capabilitytestingadditions or changes to testsadditions or changes to testsStatus: Open.Add build-namelist check: LAI streams file input file not allowed in FATES-SP mode
usabilityImprove or clarify user-facing optionsImprove or clarify user-facing optionsStatus: Open.Create self-test namelist control for decompInit
b4bbit-for-bitbit-for-bittestingadditions or changes to testsadditions or changes to testsStatus: Open.Add a system test to catch breakages in carbon isotopes
testingadditions or changes to testsadditions or changes to testsStatus: Open.