Should a crew fill a pothole with cold patch or hot mix? The answer depends on the weather, the size of the hole and how long the repair must last. Two state agency documents give practical guidance, and they do not say exactly the same thing.
Cold patch is a stockpiled mix that can go into a pothole in cold or poor weather, usually as a temporary fix. Hot mix is plant-produced asphalt that suits larger patches, and it can be hard to buy in winter. Caltrans and PennDOT differ on temperature and wet holes, so check your local agency rules.
What Cold Patch and Hot Mix Are
Cold patch is a mix that PennDOT says is designed to be stockpiled, even in cold temperatures. It stays workable and sticky while it waits. Hot mix is hot-mix asphalt, which a plant produces and which must stay hot until it is placed.
Caltrans separates cold mixes into two groups. Conventional cold (cutback) mixes can be used, but they often ravel under traffic because they need a cure, or hardening, period. Specialty quick-patch cold mixes are a different product, used for temporary emergency work on small potholes.
PennDOT adds that polymer-modified or super-modified cold mix will likely perform better than conventional material. Both sources treat conventional cold mix as the weaker option, but neither gives a performance number.
When Cold Patch Is the Right Call
Cold patch fits temporary, emergency repairs of small potholes, especially when weather is too poor for a hot-mix patch. Caltrans says the quick-patch method is most appropriate in that case, or when the road is due for rehabilitation soon.
Specialty quick-patch mixes can go straight into a pothole. Caltrans says they can be placed even in a wet hole, given minimum compaction by hand or wheel rolling, and then opened to traffic. Deeper holes should be filled in 2 to 3 inch lifts where practical.
To work out how much material a hole needs, use the Asphalt Patch Calculator. It turns area and depth into tons. This guide covers which mix to choose, not the arithmetic.
When Hot Mix Is the Better Repair
Hot mix suits larger patches and longer-term repairs. Caltrans says quick-patch products are usually not permanent and should eventually be followed by a more permanent HMA repair of the larger defective area.
Temperature is where the two sources differ most. PennDOT says best results occur when pavement and air temperatures are above 40F and rising. Caltrans gives a separate figure for larger hot-mix patches: place the mix while it is above 250F, then let it cool before traffic.
These are not the same rule. The 40F guidance covers air and pavement for patch work in general, while the 250F figure is the mix temperature at placement for larger hot patches. Caltrans also says conventional hot mix can be used if it stays hot, such as in a patching truck or trailer with a heated box.
Winter is the practical limit. PennDOT notes that hot-mix plants often shut down in winter, so hot mix may not be available to buy.
Where the Two Sources Disagree
Caltrans and PennDOT both treat conventional cold mix as the weaker choice, yet they split on wet holes. The figure below sets out each agency’s position, labeled by its document and year.
The wet-hole question is a real tension. Caltrans says specialty quick-patch cold mix can go into a wet pothole. PennDOT tells crews to clean and dry holes properly before filling. Follow your local agency’s rule when a hole is wet.
Caltrans also says its own guidance is not a standard, specification, or regulation. Treat both documents as practical guidance, and confirm the rules that apply to your road.
Prepare the Hole and Compact the Patch
PennDOT ties maximum life span and performance to clean, dry holes, tack coat on exposed surfaces, and proper compaction. A high-performance mix can remove the need for a tack coat, according to the same sheet.
- Clean and dry the hole, as PennDOT advises for best performance.
- Tack exposed surfaces with an approved tack coat, unless a high-performance mix makes it unnecessary.
- Compact deeper holes in 2 to 3 inch lifts, where practical, following Caltrans.
- Compact with a vibrating-plate compactor or roller, as PennDOT names.
PennDOT says filling a hole in one lift is not the ideal repair, though it may be the only option at times. Quick-patch products are usually a temporary repair, so plan a more permanent hot-mix repair of the larger area when you can.
After you pick a mix, estimate the material for your hole. The tool handles the volume arithmetic, and this guide covers the choice.
FAQs About Cold Patch and Hot Mix
Is cold patch as good as hot mix for a pothole?
Not in every case. Caltrans says conventional cold mix is often temporary and can ravel under traffic. PennDOT says polymer-modified cold mix will likely perform better. Neither source gives a performance number.
Can you put cold patch in a wet pothole?
Caltrans says specialty quick-patch cold mix can be placed in a wet pothole with minimum compaction, then opened to traffic. PennDOT advises cleaning and drying holes properly first. The sources differ, so follow your local agency’s rule.
What temperature is needed for cold patch or hot mix?
PennDOT says best results come when pavement and air are above 40F and rising. Caltrans says larger hot-mix patches are placed above 250F, then cooled before traffic. These are different rules, so check your local agency.
Is cold patch a permanent repair?
Usually not. Caltrans says quick-patch products are usually not permanent and should eventually be followed by a more permanent HMA repair of the larger defective area.
When is cold patch the right choice?
Cold patch fits temporary, emergency repairs of small potholes, especially when weather is too poor for a hot-mix patch. Caltrans also cites a road due for rehabilitation soon as a reason for a quick patch.
How does a crew keep hot mix hot in the field?
Caltrans says conventional hot mix can be used if it stays hot, possibly in a patching truck or trailer with a heated box. PennDOT notes that hot-mix plants often shut down in winter.
What should I check before I choose a patch?
Check your state or local agency’s patch rules, the current weather, and whether the repair is meant to be temporary. Caltrans also says its guidance is not a standard, specification, or regulation.
Sources and Further Reading
References Used in This Article
- California Department of Transportation (state agency), Maintenance Technical Advisory Guide, Volume I, Flexible Pavement Preservation, 3rd edition, Chapter 5 Patching (March 16, 2026): dot.ca.gov, MTAG Chapter 5 PDF, accessed 2026-11-13.
- Pennsylvania Department of Transportation (state agency) with PAAAM, LTAP Technical Information Sheet 185, Best Practices for Patching Potholes in Asphalt Pavements (Winter 2017): gis.penndot.gov, TS 185 PDF, accessed 2026-11-13.
The temperature and placement guidance here comes from two state agency documents that differ. Check your local agency’s patch rules before you choose a product. Reviewed for accuracy by Prof. Dr. Khalil Mudassar, PhD. Last updated 2026-11-13.
Shakeel Muzaffar is the Founder and Editor-in-Chief, with over 15 years of experience in digital publishing and online tool development. He oversees editorial quality and formula verification to ensure accurate, practical, and easy-to-use calculators.