With J < 0 the energy of a classical spin-1/2 system with three spins on an equilateral triangular lattice can be minimized with each spin pointing towards the center of the triangle (Fig. right). This non-collinear spin configuration is in fact infinitely degenerate (consider, e.g., all spins pointing away from the center), but lower in energy than any configuration with spins constrained to be along, e.g., the z axis. Indeed, this constraint would give rise to a phenomenon known as geometric spin frustration (Fig. Spin-frustrated systems have been extensively documented in the context of condensed matter physics, c.f. spin liquids and spin glasses. The simplest chemical example of spin frustration is the H 3 triangle. We note that H 3 has been observed experimentally and the H + 3 cation has been observed in the astrochemical context. As depicted in Fig. , in the region of short bond lengths (roughly <1.5Å) the usual molecular orbital picture holds, with a doubly-occupied A ′ 1 bonding orbital and one of the doubly-degenerate E ′ orbitals singly-occupied. In this region, and as expected from the MO diagram, the spins are found to be quantized along one axis according to a (non)collinearity metric, µ, developed to report on mean-field wavefunctions by Small et. al . In addition, the electrons in this region are weakly correlated, as implied by small values of the square norm of the exact two-body cumulant (i.e., obtained from the FCI wavefunction). Beyond roughly 1.5Å, µ becomes non-zero, indicating the onset of spin noncollinearity at the GHF level, and || 2 ∆|| 2 increases monotonically, indicating strong spin correlations as the dissociation limit of three neutral H atoms is approached. Applying similar reasoning one would expect to see these trends in the symmetric stretching of all odd numbered hydrogen rings. These systems are not of interest only to theory -the H 5 ring (complexed to platinum) has been identified experimentally. Other documented chemical spin frustrated systems include some fullerenes, 52 organic triradicals, and a tri-nuclear model of the active site of the oxygen evolving complex in Photosystem II. In what follows, we motivate and assess the use of GHF trials and walkers for ph-AFQMC calculations of molecular systems, particularly those that are strongly correlated. We test our implementation on the symmetric stretching of hydrogen rings (H 3 -H 8 , H 19 , and H 20 )