Arrow Postholes – building post foundations one post at a time. What makes us different is the quality of our work and uncompromising attention to detail. At Arrow Postholes, we approach post foundations with unmatched attention to detail and structural resilience. In Windsor‑Essex, frost can penetrate soils up to about 1.0 metre (3.3 ft)—significantly deeper than the often cited 37 inches (just over 3 ft). To protect against frost heave and instability, we drill each hole using the correctly sized auger bit to a minimum depth of 44–48 inches, ensuring the footing is well below the local frost line.