diff --git a/.vscode/settings.json b/.vscode/settings.json
index 9e875f7..0969248 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -1,3 +1,5 @@
 {
-    "python.defaultInterpreterPath": "${workspaceFolder}/.pixi/envs/dev/bin/python"
+    "python.defaultInterpreterPath": "${workspaceFolder}/.pixi/envs/dev/bin/python",
+    "python-envs.defaultEnvManager": "renan-r-santos.pixi-code:pixi",
+    "python-envs.defaultPackageManager": "renan-r-santos.pixi-code:pixi"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
index eec72a2..264bea6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,8 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 ## [Unreleased]
+### Added
+- `geom.transform.transition()` for determining the transition-state geometry between two geometries via `StereoCondensedReactionGraph`.
 
 ## [0.0.19] - 2026-07-17
 ### Added
diff --git a/pixi.lock b/pixi.lock
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   python_site_packages_path: lib/python3.13/site-packages
-- conda: https://conda.anaconda.org/conda-forge/linux-64/python-3.14.6-habeac84_100_cp314.conda
-  build_number: 100
-  sha256: 6d28ac2b061179deb434d3d57afa98ffd20ec3c5d44ab8048a1ca33424b22d38
-  md5: 0b9b2f83b5b600e1ac38becde8d0dd44
+- conda: https://conda.anaconda.org/conda-forge/linux-64/python-3.14.6-habeac84_101_cp314.conda
+  build_number: 101
+  sha256: ee8f2006e1724b1f2e9e0ccc5a7cfdcab973460faa2f63ac1f6e44fdad4c0344
+  md5: 78975a41cf3c525da654f17e35bfca9e
   depends:
   - __glibc >=2.17,<3.0.a0
   - bzip2 >=1.0.8,<2.0a0
@@ -1879,8 +1905,8 @@ packages:
   - libgcc >=14
   - liblzma >=5.8.3,<6.0a0
   - libmpdec >=4.0.0,<5.0a0
-  - libsqlite >=3.53.2,<4.0a0
-  - libuuid >=2.42.1,<3.0a0
+  - libsqlite >=3.53.3,<4.0a0
+  - libuuid >=2.42.2,<3.0a0
   - libzlib >=1.3.2,<2.0a0
   - ncurses >=6.6,<7.0a0
   - openssl >=3.5.7,<4.0a0
@@ -1895,8 +1921,8 @@ packages:
     - python_abi 3.14.* *_cp314
     noarch:
     - python
-  size: 36717183
-  timestamp: 1781255094700
+  size: 36869055
+  timestamp: 1784910110714
   python_site_packages_path: lib/python3.14/site-packages
 - conda: https://conda.anaconda.org/conda-forge/linux-64/pyyaml-6.0.3-py313h3dea7bd_1.conda
   sha256: ef7df29b38ef04ec67a8888a4aa039973eaa377e8c4b59a7be0a1c50cd7e4ac6
@@ -2079,6 +2105,22 @@ packages:
     - tk >=8.6.13,<8.7.0a0
   size: 3301196
   timestamp: 1769460227866
+- conda: https://conda.anaconda.org/conda-forge/linux-64/tk-8.6.13-noxft_hd70dff1_3.conda
+  build_number: 103
+  sha256: 43624eab22f5f29df7d6ffe914cf442f28fd559b55b290906255492826e636e8
+  md5: 48a1049e710857572fc2a832aa394d9f
+  depends:
+  - __glibc >=2.17,<3.0.a0
+  - libgcc >=14
+  - libzlib >=1.3.2,<2.0a0
+  constrains:
+  - xorg-libx11 >=1.8.13,<2.0a0
+  license: TCL
+  run_exports:
+    weak:
+    - tk >=8.6.13,<8.7.0a0
+  size: 3550916
+  timestamp: 1784229071544
 - conda: https://conda.anaconda.org/conda-forge/linux-64/tornado-6.5.7-py313h07c4f96_0.conda
   sha256: ed2f17b2bc92389187b47e7444aa7d6ab6c70c3f3ba6bf2ced508027e60e82cb
   md5: 9665531f18d2bcbc946e3ba0cf53ea91
@@ -2090,7 +2132,7 @@ packages:
   license: Apache-2.0
   license_family: Apache
   purls:
-  - pkg:pypi/tornado?source=compressed-mapping
+  - pkg:pypi/tornado?source=hash-mapping
   run_exports: {}
   size: 885824
   timestamp: 1781006802459
@@ -2128,19 +2170,19 @@ packages:
   run_exports: {}
   size: 408932
   timestamp: 1770909099052
-- conda: https://conda.anaconda.org/conda-forge/linux-64/uv-0.11.29-h2112641_0.conda
-  sha256: a5b92c2cedcaba3b877d6c4aab42853f57b6bb26f9c901cfb5aa5da03269d310
-  md5: 5552b8d0f33cf86753d35da1b3ec0736
+- conda: https://conda.anaconda.org/conda-forge/linux-64/uv-0.11.31-h2112641_0.conda
+  sha256: 972605a00975e31e550b761b77c38c4700f98541de277998d4d5e6c4372de4f8
+  md5: 06a0144a3d10bf336d9f16472d3e2fcc
   depends:
+  - __glibc >=2.17,<3.0.a0
   - libstdcxx >=14
   - libgcc >=14
-  - __glibc >=2.17,<3.0.a0
   constrains:
   - __glibc >=2.17
   license: Apache-2.0 OR MIT
   run_exports: {}
-  size: 20782187
-  timestamp: 1784166603021
+  size: 20873084
+  timestamp: 1784709345198
 - conda: https://conda.anaconda.org/conda-forge/linux-64/uv-0.11.8-h29f5ae7_1.conda
   sha256: 01e4bd3ef63e893ef908b57cbde1132c49141f6794eb2d54558627876e02d9d0
   md5: ccec3ef299ab5d8892ebec5485bc9616
@@ -2154,20 +2196,20 @@ packages:
   purls: []
   size: 19114693
   timestamp: 1777486136750
-- conda: https://conda.anaconda.org/conda-forge/linux-64/uv-build-0.11.29-h9a1d3cd_0.conda
+- conda: https://conda.anaconda.org/conda-forge/linux-64/uv-build-0.11.31-h9a1d3cd_0.conda
   noarch: python
-  sha256: 1cef7c8411dc878a2fa68a7c7139819aaac7f95775bf693453a337a76af3a4de
-  md5: b467f466bf61b9e722b4b0aed9dc1f17
+  sha256: 68968271d12dd4744f07dd4a7d4345c0739b9741a7960f86bcc97f5c0001ddbb
+  md5: 00755d769e50e96591a6b06d866463d6
   depends:
   - python >=3.10
-  - libgcc >=14
   - __glibc >=2.17,<3.0.a0
+  - libgcc >=14
   constrains:
   - __glibc >=2.17
   license: Apache-2.0 AND MIT AND BSD-2-Clause
   run_exports: {}
-  size: 2040501
-  timestamp: 1784165418663
+  size: 2042045
+  timestamp: 1784703682715
 - conda: https://conda.anaconda.org/conda-forge/linux-64/uvloop-0.22.1-py313h07c4f96_1.conda
   sha256: 77a220ecf6c1467f94d6adda5fb1296f558f3f3044842dc0a52881eab5908dc0
   md5: 266caaa8701a13482ea924a77897b1e4
@@ -2516,15 +2558,15 @@ packages:
   purls: []
   size: 131039
   timestamp: 1776865545798
-- conda: https://conda.anaconda.org/conda-forge/noarch/ca-certificates-2026.6.17-hbd8a1cb_0.conda
-  sha256: f8e3c730fa14ee3f170493779f06522c4acf89169f43db4f039727709b6419cf
-  md5: a9965dd99f683c5f444428f896635716
+- conda: https://conda.anaconda.org/conda-forge/noarch/ca-certificates-2026.7.22-hbd8a1cb_0.conda
+  sha256: 0a0544cf95f64394fe4959286f5c71f5444ad58feb0602e53becb27448d24da6
+  md5: 0f51e2391ade309db462a55611263e9c
   depends:
   - __unix
   license: ISC
   run_exports: {}
-  size: 128866
-  timestamp: 1781708962055
+  size: 131780
+  timestamp: 1784754889428
 - conda: https://conda.anaconda.org/conda-forge/noarch/cachetools-7.0.6-pyhd8ed1ab_0.conda
   sha256: f31f02b8bfa312bca79abbc24a0dd1930291cbdaca321b6d1c230687b175a9ff
   md5: 14e77b3ebe7b8e37f6254a59ee245184
@@ -2857,6 +2899,7 @@ packages:
   license_family: BSD
   purls:
   - pkg:pypi/flexcache?source=hash-mapping
+  run_exports: {}
   size: 16674
   timestamp: 1733663669958
 - conda: https://conda.anaconda.org/conda-forge/noarch/flexparser-0.4-pyhd8ed1ab_1.conda
@@ -2870,6 +2913,7 @@ packages:
   license_family: BSD
   purls:
   - pkg:pypi/flexparser?source=hash-mapping
+  run_exports: {}
   size: 28686
   timestamp: 1733663636245
 - conda: https://conda.anaconda.org/conda-forge/noarch/font-ttf-dejavu-sans-mono-2.37-hab24e00_0.tar.bz2
@@ -3437,6 +3481,7 @@ packages:
   license_family: BSD
   purls:
   - pkg:pypi/pint?source=hash-mapping
+  run_exports: {}
   size: 245230
   timestamp: 1773969991837
 - conda: https://conda.anaconda.org/conda-forge/noarch/platformdirs-4.9.6-pyhcf101f3_0.conda
@@ -3508,6 +3553,7 @@ packages:
   license_family: MIT
   purls:
   - pkg:pypi/py3dmol?source=hash-mapping
+  run_exports: {}
   size: 13737
   timestamp: 1769417304572
 - conda: https://conda.anaconda.org/conda-forge/noarch/pycparser-2.22-pyh29332c3_1.conda
@@ -4226,6 +4272,13 @@ packages:
   run_exports: {}
   size: 119135
   timestamp: 1767016325805
+- conda: https://conda.anaconda.org/conda-forge/noarch/tzdata-2026c-h151e31d_0.conda
+  sha256: b928c30ddcb0e3f544c6eade8352737e6e610e263276b90232db6a578ef899d8
+  md5: fcb489df604d100968b737f2cb6076c6
+  license: LicenseRef-Public-Domain
+  run_exports: {}
+  size: 118849
+  timestamp: 1784250406640
 - conda: https://conda.anaconda.org/conda-forge/noarch/unidecode-1.4.0-pyhcf101f3_1.conda
   sha256: 184d1377f88251983ef5154aea0d6cb73108afc8510ed66526afb1c44b2e1259
   md5: 53cb4b14ab0841e104e2bd11ee64b840
@@ -4327,7 +4380,7 @@ packages:
   - pkg:pypi/zipp?source=hash-mapping
   size: 24461
   timestamp: 1776131454755
-- conda_source: automol[d00f6c44] @ .
+- conda_source: automol[5fa33e89] @ .
   variants:
     target_platform: noarch
   depends:
@@ -4346,25 +4399,25 @@ packages:
   - conda: https://conda.anaconda.org/conda-forge/linux-64/ld_impl_linux-64-2.46.1-default_hbd61a6d_102.conda
   - conda: https://conda.anaconda.org/conda-forge/linux-64/libexpat-2.8.1-hecca717_1.conda
   - conda: https://conda.anaconda.org/conda-forge/linux-64/libffi-3.5.2-h3435931_0.conda
-  - conda: https://conda.anaconda.org/conda-forge/linux-64/libgcc-15.2.0-he0feb66_19.conda
-  - conda: https://conda.anaconda.org/conda-forge/linux-64/libgomp-15.2.0-he0feb66_19.conda
+  - conda: https://conda.anaconda.org/conda-forge/linux-64/libgcc-15.2.0-he0feb66_20.conda
+  - conda: https://conda.anaconda.org/conda-forge/linux-64/libgomp-15.2.0-he0feb66_20.conda
   - conda: https://conda.anaconda.org/conda-forge/linux-64/liblzma-5.8.3-hb03c661_0.conda
   - conda: https://conda.anaconda.org/conda-forge/linux-64/libmpdec-4.0.0-hb03c661_1.conda
   - conda: https://conda.anaconda.org/conda-forge/linux-64/libsqlite-3.53.3-h0c1763c_0.conda
-  - conda: https://conda.anaconda.org/conda-forge/linux-64/libstdcxx-15.2.0-h934c35e_19.conda
+  - conda: https://conda.anaconda.org/conda-forge/linux-64/libstdcxx-15.2.0-h934c35e_20.conda
   - conda: https://conda.anaconda.org/conda-forge/linux-64/libuuid-2.42.2-h5347b49_0.conda
   - conda: https://conda.anaconda.org/conda-forge/linux-64/libzlib-1.3.2-h25fd6f3_2.conda
   - conda: https://conda.anaconda.org/conda-forge/linux-64/ncurses-6.6-hdb14827_0.conda
   - conda: https://conda.anaconda.org/conda-forge/linux-64/openssl-3.6.3-h35e630c_0.conda
-  - conda: https://conda.anaconda.org/conda-forge/linux-64/python-3.14.6-habeac84_100_cp314.conda
+  - conda: https://conda.anaconda.org/conda-forge/linux-64/python-3.14.6-habeac84_101_cp314.conda
   - conda: https://conda.anaconda.org/conda-forge/linux-64/readline-8.3-h853b02a_0.conda
-  - conda: https://conda.anaconda.org/conda-forge/linux-64/tk-8.6.13-noxft_h366c992_103.conda
-  - conda: https://conda.anaconda.org/conda-forge/linux-64/uv-0.11.29-h2112641_0.conda
-  - conda: https://conda.anaconda.org/conda-forge/linux-64/uv-build-0.11.29-h9a1d3cd_0.conda
+  - conda: https://conda.anaconda.org/conda-forge/linux-64/tk-8.6.13-noxft_hd70dff1_3.conda
+  - conda: https://conda.anaconda.org/conda-forge/linux-64/uv-0.11.31-h2112641_0.conda
+  - conda: https://conda.anaconda.org/conda-forge/linux-64/uv-build-0.11.31-h9a1d3cd_0.conda
   - conda: https://conda.anaconda.org/conda-forge/linux-64/zstd-1.5.7-hb78ec9c_6.conda
-  - conda: https://conda.anaconda.org/conda-forge/noarch/ca-certificates-2026.6.17-hbd8a1cb_0.conda
+  - conda: https://conda.anaconda.org/conda-forge/noarch/ca-certificates-2026.7.22-hbd8a1cb_0.conda
   - conda: https://conda.anaconda.org/conda-forge/noarch/python_abi-3.14-8_cp314.conda
-  - conda: https://conda.anaconda.org/conda-forge/noarch/tzdata-2025c-hc9c84f9_1.conda
+  - conda: https://conda.anaconda.org/conda-forge/noarch/tzdata-2026c-h151e31d_0.conda
 - pypi: https://files.pythonhosted.org/packages/07/6c/aa3f2f849e01cb6a001cd8554a88d4c77c5c1a31c95bdf1cf9301e6d9ef4/defusedxml-0.7.1-py2.py3-none-any.whl
   name: defusedxml
   version: 0.7.1
diff --git a/pixi.toml b/pixi.toml
index 417e93c..f9a7d28 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -36,7 +36,6 @@ ipykernel = "*"
 
 [feature.dev.pypi-dependencies]
 keepachangelog = "*"
-xyzrender = ">=0.3.1, <0.4"
 
 [feature.docs.dependencies]
 sphinx = "*"
@@ -51,6 +50,7 @@ dev = { features = ["dev", "docs"], solve-group = "default"}
 [pypi-dependencies]
 stereomolgraph = ">=0.0.22b0"
 irmsd = "==0.1.1"
+xyzrender = ">=0.3.1, <0.4"
 
 [feature.dev.tasks]
 # Manage pyproject.toml with uv
diff --git a/src/automol/geom/__init__.py b/src/automol/geom/__init__.py
index 2ffec2c..42f379c 100644
--- a/src/automol/geom/__init__.py
+++ b/src/automol/geom/__init__.py
@@ -5,6 +5,7 @@
 from .core import (
     Geometry,
     from_rdkit_mol,
+    from_stereo_mol_graph,
     from_xyz_block,
     from_xyz_file,
     hill_formula,
@@ -23,6 +24,7 @@
 )
 from .internal import angles, bonds, dihedrals, set_distance
 from .properties import adjacency_matrix, center_of_mass, distance_keys, distance_matrix
+from .transform import transition
 from .vibration import (
     harmonic_zpv,
     mass_weight_vector,
@@ -45,6 +47,7 @@
     "distance_matrix",
     "eckart_frame",
     "from_rdkit_mol",
+    "from_stereo_mol_graph",
     "from_xyz_block",
     "from_xyz_file",
     "harmonic_zpv",
@@ -62,6 +65,7 @@
     "set_distance",
     "stereo_mol_graph",
     "transform",
+    "transition",
     "translational_normal_modes",
     "vibrational_analysis",
     "view",
diff --git a/src/automol/geom/core.py b/src/automol/geom/core.py
index 32807f1..2086652 100644
--- a/src/automol/geom/core.py
+++ b/src/automol/geom/core.py
@@ -217,6 +217,12 @@ def stereo_mol_graph(geo: Geometry) -> StereoMolGraph:
     return StereoMolGraph.from_geometry(sm_geo)  # ty:ignore[invalid-argument-type]
 
 
+def from_stereo_mol_graph(smg: StereoMolGraph, *, charge: int = 0) -> Geometry:
+    """Instantiate a Geometry from a StereoMolGraph."""
+    mol = smg.to_rdmol(charge=charge)
+    return from_rdkit_mol(mol)
+
+
 def hill_formula(geo: Geometry) -> str:
     """Render the molecular formula in Hill order."""
     counts = Counter(s.capitalize() for s in geo.symbols)
diff --git a/src/automol/geom/transform.py b/src/automol/geom/transform.py
index 49bf68d..65b1335 100644
--- a/src/automol/geom/transform.py
+++ b/src/automol/geom/transform.py
@@ -6,6 +6,9 @@
 import numpy as np
 from numpy.typing import ArrayLike
 from scipy.spatial.transform import Rotation
+from stereomolgraph import StereoCondensedReactionGraph
+
+from .core import from_stereo_mol_graph, stereo_mol_graph
 
 if TYPE_CHECKING:
     from .core import Geometry
@@ -93,3 +96,39 @@ def rotate(
     mask = slice(None) if keys is None else list(keys)
     geo.coordinates[mask] = rot.apply(geo.coordinates[mask])
     return geo
+
+
+def transition(geo1: "Geometry", geo2: "Geometry") -> "Geometry":
+    """Determine the transition geometry between two geometries.
+
+    Parameters
+    ----------
+    geo1
+        Initial geometry.
+    geo2
+        Final geometry.
+
+    Returns
+    -------
+        Geometry.
+    """
+    if geo1.spin != geo2.spin:
+        msg = f"Geometries must have the same spin: {geo1.spin} != {geo2.spin}"
+        raise ValueError(msg)
+
+    smg1 = stereo_mol_graph(geo1)
+    smg2 = stereo_mol_graph(geo2)
+    scrg = StereoCondensedReactionGraph.from_graphs(smg1, smg2)
+
+    active_h = [a for a in scrg.active_atoms() if scrg.get_atom_type(a) == 1]
+    for h in active_h:
+        scrg.set_atom_attribute(h, "atom_type", 8)
+
+    ts_smg = scrg.ts()
+    ts_geo = from_stereo_mol_graph(ts_smg)
+    ts_geo.spin = geo1.spin
+
+    for h in active_h:
+        ts_geo.symbols[h] = "H"
+
+    return ts_geo
diff --git a/tests/test_transform.py b/tests/test_transform.py
index 95babad..9e02198 100644
--- a/tests/test_transform.py
+++ b/tests/test_transform.py
@@ -1,6 +1,7 @@
 """Geometry transform tests."""
 
 import numpy as np
+import pytest
 from scipy.spatial.transform import Rotation
 
 from automol import Geometry, geom
@@ -58,3 +59,45 @@ def test__rotate_in_place(water: Geometry) -> None:
     result = geom.transform.rotate(water, rot, in_place=True)
     assert result is water
     assert np.allclose(water.coordinates, expected)
+
+
+def test__transition_raises_for_mismatched_spin(water: Geometry) -> None:
+    """Test that transition() rejects geometries with different spins."""
+    water_triplet = water.model_copy(update={"spin": 2})
+    assert water.spin != water_triplet.spin
+    with pytest.raises(ValueError, match="spin"):
+        geom.transform.transition(water, water_triplet)
+
+
+def test__transition_identity(water: Geometry) -> None:
+    """Test the (degenerate) transition between a geometry and itself."""
+    ts_geo = geom.transform.transition(water, water)
+    assert ts_geo.symbols == water.symbols
+    assert ts_geo.spin == water.spin
+    assert ts_geo.coordinates.shape == water.coordinates.shape
+    assert np.all(np.isfinite(ts_geo.coordinates))
+
+
+def test__transition_hydrogen_abstraction() -> None:
+    """Test the transition geometry for an H-abstraction reaction.
+
+    F-H + Cl -> F + H-Cl: the migrating H atom breaks its bond to F and forms
+    a new bond to Cl.
+    """
+    reactant = Geometry(
+        symbols=["F", "H", "Cl"],
+        coordinates=[[0, 0, 0], [0.92, 0, 0], [3.5, 0, 0]],
+        charge=0,
+        spin=0,
+    )
+    product = Geometry(
+        symbols=["F", "H", "Cl"],
+        coordinates=[[0, 0, 0], [3.0, 0, 0], [4.27, 0, 0]],
+        charge=0,
+        spin=0,
+    )
+    ts_geo = geom.transform.transition(reactant, product)
+    assert ts_geo.symbols == reactant.symbols
+    assert ts_geo.spin == reactant.spin
+    assert ts_geo.coordinates.shape == reactant.coordinates.shape
+    assert np.all(np.isfinite(ts_geo.coordinates))