Pothole Season NZ — AT Data Shows Why July Is Auckland's Worst Month
Pothole season is real, and now there's a dataset to prove it. Auckland Transport's complete pothole dispatch log — 26,863 records from January 2024 to June 2026, released to us under LGOIMA — shows the same shape every year: dispatches climb through autumn, peak in winter (June–September), every single year, then fall away through summer.
The worst month on record: July 2025, with 2,029 pothole dispatches — averaged out, Auckland logged a new pothole roughly every 22 minutes, day and night, for the entire month.
It's mid-June now. If the public network is about to hit its annual peak, so is every carpark and driveway in the region — same asphalt, same rain, same physics. This post covers why winter manufactures potholes, what the surge looks like in AT's numbers, and why the next fortnight is the cheapest time to deal with your own surface.
Why winter makes potholes
Three ingredients, all at their annual maximum in July. Water: winter rain saturates the pavement structure through every crack and joint; a saturated basecourse loses stiffness and the asphalt above it flexes under each wheel. Cold: bitumen stiffens as temperature drops, so instead of flexing and recovering, the cold surface cracks. Traffic: the loads don't stop for weather — every axle over a saturated, brittle pavement pumps water through the structure and lifts material out of opening cracks. Water in, flex, crack, pump, hole. The cycle runs fastest in exactly the weeks Auckland is entering now.
What the surge looks like in AT's data
Winter (June–September) is the peak season in all three years of the dataset — this isn't a one-bad-winter artefact. July 2025's 2,029 dispatches made it the biggest single month in the record, and the winter months consistently run multiples of the summer trough. The spend line follows: AT's pothole repair claims have tripled from $0.69M (FY24) to $2.11M (FY26). The full analysis — including the 96% on-target response rate and the 28% of reports closed without repair — is in our complete AT data breakdown, and the area-by-area picture is in the pothole hotspots post.
Your asphalt runs the same calendar
AT's curve is just Auckland's asphalt responding to Auckland's winter — and your driveway or carpark is on the identical schedule. The difference is queue position: AT has crews dispatching to 2,000 faults a month at the peak; private surfaces have whoever the owner calls. Every defect that goes into July open — a ponding depression, a zone of alligator cracking, an open edge — comes out of winter bigger. The repair-cost ladder only goes up: what's a levelling patch in June is a cut-and-re-lay by September.
Can you even repair asphalt in winter?
Yes — winter repair is standard practice with the right method and materials, and we run through the full trade-offs in the winter vs summer repair timing guide. Polymer-modified cold-mix takes traffic almost immediately and is built for cold, damp placement; hot-mix work needs a dry weather window but Auckland winters provide plenty. What doesn't work is waiting: a surface that's already taking on water loses more structure with every wet week. Mid-June — right now — is the last cheap exit before the July peak. Carpark owners should scope the season's work now; the property manager's carpark guide covers how.
Frequently asked questions
When is pothole season in New Zealand?
Winter — June to September. Auckland Transport's dispatch data peaks in those months in every year on record, with July 2025 the worst single month (2,029 dispatches). The driver is winter rain saturating pavements, not just cold.
Why was July 2025 so bad?
A wet, cold mid-winter on a network already carrying deferred wear. Saturated basecourse + stiff cold bitumen + unchanged traffic loads = the pothole production line at full speed. 2,029 dispatches is one every 22 minutes for the month.
Should I wait until summer to repair my driveway or carpark?
No — waiting through a winter is the most expensive option because the defect grows all season. Winter repair with the right materials is routine; see the timing guide. Fix small in June rather than big in October.
Does the winter surge affect repair availability?
Yes — July and August are the busiest months for every asphalt crew in the region, public and private. Booking in June means your job is scheduled before the peak queue forms; that's simple queueing maths.
Who fixes winter potholes on public roads vs private property?
Public road reserve: Auckland Transport — report it and the data says they respond fast (96% within target). Carparks, driveways, rights-of-way: the owner. For those, photo-quote it — fixed price within 24 hours.
The July peak is three weeks away. Fix it while it's small. Photos in via the photo-quote form or fix@rapidpatch.co.nz — fixed price within 24 hours, winter-rated materials, 12-month workmanship warranty.
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