A soil moisture sensor assembly for a seed-planting implement includes a furrow firmer configured to shape a furrow being formed in soil by the seed-planting implement, with the furrow firmer extending in a vertical direction from a top end to a bottom end. The furrow firmer defines a cavity at the bottom end. Furthermore, the assembly includes first and second electrodes positioned within the cavity for use in determining the soil moisture of the soil. Additionally, the assembly includes a non-electrically conductive housing positioned between the first and second electrodes and the furrow firmer in the vertical direction.

A soil moisture sensor assembly for a seed-planting implement includes a furrow firmer configured to shape a furrow being formed in soil by the seed-planting implement, with the furrow firmer extending in a vertical direction from a top end to a bottom end. The furrow firmer defines a cavity at the bottom end. Furthermore, the assembly includes first and second electrodes positioned within the cavity for use in determining the soil moisture of the soil. Additionally, the assembly includes a non-electrically conductive housing positioned between the first and second electrodes and the furrow firmer in the vertical direction.