The Two-Week Rule: How Fast Winter Potholes Grow
Two weeks ago it was a crack. You noticed it, thought "I should sort that," and carried on. Now it is a hole, and you steer around it on the way to the letterbox.
That is not bad luck. That is how winter potholes behave. They sit still for a while, then they run. Once you understand the loop that drives them, the two-week check-in becomes the cheapest habit you can keep on your property.
Why a crack becomes a hole so fast
A pothole grows through a loop, and each turn of the loop makes the next turn worse.
Water gets into the crack. It soaks the base underneath and softens it. A tyre rolls over, presses down, and the soft spot flexes. That flex plucks a little material off the edge of the crack. Now the opening is slightly wider, so it holds slightly more water, so the next rain soaks a little deeper, so the next tyre plucks a little more.
Slow, slow, then sudden. The early turns of the loop are almost invisible. By the time the hole is dinner-plate sized, each cycle is removing a chunk you can see. That is the point where owners say it "appeared overnight." It did not. It had been building for weeks, and it finally crossed the line where the damage got obvious.
Winter is the accelerant. The loop needs water and traffic, and an Auckland July delivers both. The rain keeps the base saturated between fronts, so the softening never gets a chance to reverse. A dry summer month gives the base time to firm up between wettings. A wet winter fortnight does not.
The maths of compounding
The reason the two-week rule matters is that pothole growth is not linear. It compounds.
A bigger hole has a bigger opening, so it catches more rain.
More water means a wetter, softer base under the edges.
A wider hole sits under more of the tyre's contact patch, so more of each pass lands on the failing edge.
Every one of those factors feeds the next, so the rate of loss climbs as the hole grows.
That is why the last two weeks always look worse than the first two. The defect is not just getting bigger. It is getting faster. Waiting does not hold the cost flat. It lets the cost climb, and the climb steepens the longer you leave it.
The intervention point: dinner plate, not wheel-swallow
There is a sweet spot for fixing a pothole, and it is earlier than most people think.
Fix it at dinner-plate size and you are usually buying a standard patch: cut back to a sound edge, check the base, lay hot mix, compact, done. A single standard patch starts from $450 as a fixed price, quoted from a photo. Clean, contained, one visit.
Let it reach wheel-swallow size and the job changes. The failure has spread past the visible edge into the base. Now the repair is wider, sometimes deeper, and the price moves with it. What the water was quietly doing to the base underneath is the part that turns a small patch into a bigger one, and that is exactly what the puddle sitting in the low spot is telling you.
You can see the difference in the numbers on our Auckland pothole repair cost guide. Small and early beats large and urgent every time.
The phone-photo habit
You do not need a moisture meter or an engineer to manage this. You need a phone and a fortnightly reminder.
The trick is consistency, so you can actually see the change:
Same angle. Stand in the same spot each time. Standing in a different place makes a growing hole look stable.
Same scale. Drop a coin, a tennis ball, or a tape measure in the frame. Now the photo tells you the size, not just the shape.
Same interval. Every two weeks through winter. Set a calendar nudge so it happens whether or not it is raining.
Two or three photos in and the pattern is obvious. Either the defect is holding steady, in which case you keep watching, or the edge is retreating between shots, in which case it is time to act. This is about the cheapest asset management there is: two minutes a fortnight to catch a small problem before it becomes an expensive one.
What an Auckland winter fortnight does
The same defect behaves very differently by season, and it comes down to how long the base stays wet.
In summer, a hole might get rained on, then sit dry for a week while the base firms back up. The loop stalls. Growth is slow.
In winter, the fronts come through often enough that the base rarely dries out. Every wet-dry-traffic cycle stacks on top of a base that is already soft from the last one. A fortnight of Auckland winter rain can move a defect further than a whole month of summer, purely because the water never leaves. That is why the crack you filed under "later" in June is a steering hazard by July.
It also means Auckland's potholes are a water problem, not a freezing one. The fix that lasts deals with where the water is going, not just the hole on the surface. A patch that ignores the water source tends to come back in the same spot the following winter.
Catch it early: send a photo
If your fortnightly check turns up an "act" defect, the photos you already took are the photos we need.
Send us a clear shot of the hole with a coin or tape in the frame, plus one wider shot of the surrounding area, and send us a photo for a fixed price. You get a fixed quote back within 24 hours, no site visit required, and a standard patch starts from $450. Knowing what to include is easy: our short guide on what to photograph for an accurate fixed price covers it in a minute.
Catch it at dinner-plate size and winter stops being the season your driveway falls apart. It becomes the season you got in early.
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