In its simplest form, a spray seal is hot bitumen sprayed onto the pavement, then covered at once with one layer of crushed stone. It bonds best in warm, dry, settled weather on a clean surface that is not wet. In Queensland, the risks are winter cold (longest inland) and rain, which peaks from December to March on BoM averages.
Updated 25 September 2026.
Planning a seal around the weather? Book an on-site assessment. Based in Cooroy, working across the Sunshine Coast, Noosa and Gympie, Moreton Bay, Brisbane north, the Fraser Coast, the Burnetts, Bundaberg, Toowoomba and the Western Downs. See our service areas.
There is no best month for the whole state. The best window is a warm, dry, settled spell, with no rain likely before the stone is spread and rolled or in the first days after. On TMR’s cold-weather ratings, every coastal station below is low risk from October to April, and most inland stations from November to March.
The ratings come from TMR’s Technical Note TN186, Sealing in Cold Weather Conditions (August 2019), built from BoM records. They are TMR’s ratings for its own road projects using hot sprayed seals, not a rule for a private driveway, and a low-risk month can still be wet. For roads, yards and reseals, see our bitumen spray sealing service.
Coastal winters are mild, with average July lows of 8.7°C to 11.3°C; July is the coldest month at every station. Even so, TN186 rates July as high risk at every coastal station.
| District (TN186 station) | Low risk (Level 1) | Medium risk (Level 2) | High risk (Level 3) | July mean minimum |
|---|---|---|---|---|
| Noosa (Tewantin RSL Park) | Jan to Apr, Sep to Dec | May, Jun, Aug | Jul | 11.3°C |
| Sunshine Coast (Sunshine Coast Airport) | Jan to Apr, Oct to Dec | May, Sep | Jun to Aug | 9.7°C |
| Brisbane north (Brisbane) | Jan to Apr, Sep to Dec | May, Jun | Jul, Aug | 10.5°C |
| Moreton Bay (Redcliffe) | Jan to May, Sep to Dec | Jun, Aug | Jul | 11.2°C |
| Fraser Coast (Maryborough) | Jan to Apr, Oct to Dec | May, Sep | Jun to Aug | 8.7°C |
| Fraser Coast (Hervey Bay Airport) | Jan to Apr, Oct to Dec | May, Sep | Jun to Aug | 10.0°C |
| Bundaberg (Bundaberg Aero) | Jan to Apr, Oct to Dec | May, Jun, Sep | Jul, Aug | 10.3°C |
Source: TMR TN186 (August 2019), Appendix A, Table A1 (seals other than initial seals); BoM mean minimum temperatures (station periods differ). Checked 25 September 2026.
Inland July lows average 3.9°C to 7.3°C, colder than at any coastal station. TN186 rates May to September as high risk at every inland station, and Kingaroy through October.
| District (TN186 station) | Low risk (Level 1) | Medium risk (Level 2) | High risk (Level 3) | July mean minimum |
|---|---|---|---|---|
| Gympie (Gympie) | Jan to Mar, Nov, Dec | Apr, Oct | May to Sep | 6.4°C |
| South Burnett (Kingaroy Airport) | Jan to Mar, Dec | Apr, Nov | May to Oct | 3.9°C |
| North Burnett (Gayndah Airport) | Jan to Apr, Oct to Dec | none | May to Sep | 7.3°C |
| Toowoomba (Toowoomba Airport) | Jan to Mar, Nov, Dec | Apr, Oct | May to Sep | 6.7°C |
| Western Downs (Dalby Airport) | Jan to Mar, Nov, Dec | Apr, Oct | May to Sep | 4.1°C |
| Western Downs (Miles Constance Street) | Jan to Mar, Nov, Dec | Apr, Oct | May to Sep | 4.4°C |
Source: as above.
A spray seal needs a clean surface that is not wet, a pavement warm enough for the hot binder to grip the stone (with its temperature stable or rising), no strong wind, and no rain until the stone is spread and rolled. On TMR roads, MRTS11 (July 2025) sets these limits for non-emulsion seals, and MRTS12 covers emulsion seals.
The stone is held by the binder’s grip, the stones locking together and the bond to the base, and hot binder cools to the pavement temperature very quickly. Cold, wet or dusty conditions weaken that hold from the start.
| Condition | Why it matters | TMR default for its own works (your job’s specification can differ) |
|---|---|---|
| Pavement temperature | Hot binder cools to the surface temperature very quickly, raising the risk of stone loss | Above the minimum, and stable or rising, for an hour before spraying: 10°C for primes; 15°C for initial seals with AMC5 or AMC6 cutback; 20°C for standard bitumen, AMC7, multigrade and crumb rubber; 25°C for other polymer modified binders. Rolling must finish before the surface cools below it (MRTS11 cl 11.2; TN186 s4.1) |
| Overnight lows | Cold weather early in a seal’s life raises the risk of stripping | Air likely below 10°C in the seven days after sealing: special measures should be considered, and TMR’s Level 2 and 3 locations need approval to proceed (TN186 s4.1, s7.1) |
| Wet pavement | Spraying on a wet surface raises the risk of the seal de-bonding | No spraying on a wet surface; dry or dusty surfaces get a light watering just before spraying (MRTS11 cl 11.3, cl 10.1.2) |
| Rain before rolling | On an initial seal, rain soon after sealing can bury or strip stone and emulsify the binder | No spraying in rain or if rain is likely before the stone is spread and rolled (MRTS11 cl 11.3; MRTS12 cl 11.4) |
| Wind | Austroads notes wind chill can cool a fresh binder quickly | No spraying in winds over 30 km/h or during dust storms (MRTS11 cl 11.3) |
| Very hot days | A new seal can stay tender until it beds down, turning and braking tyres can shear it, and too much cutter oil can bleed in hot weather | No upper limit found for hot bitumen seals in MRTS11 or Austroads Part 4K; the binder can be adjusted for the weather instead (MRTS11 cl 12.7; TN175). TMR does not recommend emulsions on a pavement above 50°C (TN186 s4.8) |
Source: TMR MRTS11 (July 2025), MRTS12 (November 2018), TN186 (August 2019) and TN175 (December 2025); Austroads Guide to Pavement Technology Part 4K (2026). Checked 25 September 2026.
“Not wet” is not the same as bone dry. Austroads says a surface for an initial seal (a seal sprayed straight onto a prepared base that has not been primed) should be slightly damp but not wet: a wet pavement can make the stone sink and the binder flush up, while a dry one may stop the binder bonding. A prime and seal is different: the pavement must be dry.
Emulsion seals can go down on cooler surfaces: TMR’s default is a pavement above 10°C, and it suggests considering emulsions or double/double seals in wet or damp conditions. But they gain strength more slowly, so traffic waits longer when it is cool, and TMR does not recommend them outside a 10°C to 50°C pavement range. A new emulsion seal is also vulnerable to traffic if rain falls within a few days.
When you get a quote, ask which binder and seal type is planned for the season.
Yes, within limits. In winter the usable part of the day can be shorter, because the surface must be above the minimum, and stable or rising, for an hour before spraying, and work must finish before it cools again. Summer warmth suits the binder, but rain is the limit in the wetter summer months (December to March on BoM averages).
| Season | What the records show | What it means for a new seal |
|---|---|---|
| Spring (September to November) | Coast: low cold risk by October, or September at Tewantin, Brisbane and Redcliffe. Inland: high risk through September. The driest coastal months are August or September | The coast opens first; inland jobs wait for warmer weeks |
| Summer and early autumn (December to March) | The wetter months at every station. Rain days peak in March at most coastal stations and in December at most inland ones. Inland heat: Miles averages 12.6 days of 35°C or more in January and Dalby 7.3; coastal stations 1.3 or fewer | Warm surfaces suit the binder, but rain stops spraying, and too much cutter oil in a new seal can bleed in hot weather. Allow weather days |
| Late autumn (April and May) | Coast: medium risk in May at most stations, and May is still wet at Tewantin and Sunshine Coast Airport (162.1 mm and 164.7 mm on average). Inland: mostly medium risk in April, high from May | The cold-risk months begin, inland first |
| Winter on the coast (June to August) | July lows of 8.7°C to 11.3°C; high risk in July at every station | Starts can be later and finishes earlier: the surface must be above the minimum for an hour before spraying, and rolling must finish before it cools |
| Winter inland (May to September) | July lows of 3.9°C to 7.3°C; high risk from May to September, and to October at Kingaroy | The highest cold risk in the area. TMR rates initial seals no higher than medium risk; a seal over a prime is rated like any other seal |
Source: BoM climate statistics (13 stations); TMR TN186 (August 2019), Appendix A. Checked 25 September 2026.
TN186 rates each month at each BoM station by the median number of days with a minimum below 10°C and days with more than 2 mm of rain, giving three risk levels:
Initial seals (sprayed straight onto an unprimed base) are rated lower, as they typically carry at least six parts of cutter oil in the colder months. The note covers TMR projects with hot sprayed seals, not emulsions or repairs under about 100 m², and other road owners decide for themselves.
On TMR works, spraying does not start if rain is likely before the stone is spread and rolled, and stops at once if rain begins. Rain in the first days can also do harm: in cold weather it raises the stripping risk, and on an initial seal it can bury stone, emulsify the binder and let tyres pick it up.
On TMR works, a seal sprayed in rain or on a wet surface is rejected. TN186 also notes that spraying over a wet surface raises the risk of the seal de-bonding from the pavement. Wet stone carrying free water is not loaded into the spreader either, so after a downpour the job can wait on both the pavement and the stockpile.
Austroads lists what rain can do soon after an initial seal:
On a primed base, rain can wash uncured primer off. TMR notes that the risk of stripping rises when cold, or cold and damp, weather comes early in a seal’s life. New seals can stay tender until they bed down and some cutter oil evaporates, or an emulsion cures. So the forecast for the days after sealing matters too: on TMR works, air likely below 10°C in the seven days after sealing calls for special measures to be considered.
Much of the “24 hours after sealing” rain advice online is written for painted sealcoat products. SealMaster’s MasterSeal Ultra, for example, is an asphalt emulsion sealer applied by squeegee, brush or spray over existing asphalt to protect it and improve its look, with drying and rain times set by its maker, measured in hours. A spray seal is a thin layer of sprayed bitumen, applied hot or as an emulsion, with stone set into it, and its rain rules come from TMR and Austroads.
Before spraying, the pavement, the forecast and the wind are checked against the job’s specification. On TMR works: surface temperature above the minimum and stable or rising, no wet surface, no rain likely before rolling, and wind no more than 30 km/h.
The temperature check must allow for shaded areas, and TN186 says colder spots such as low-lying areas and creek crossings should be considered.
For TMR’s higher-risk (Level 2 and 3) periods, TN186 also sets out a weather watch:
Book ahead of the window you want rather than waiting for a fine week. Aim to have base and drainage work finished before the wetter summer months (December to March on BoM averages), and allow weather days in the plan, because rain days peak in March at most coastal stations.
When you book, ask:
If your driveway runs under trees or through a gully, those sections may be the last to warm up: TMR notes that shaded, low-lying areas and creek crossings run colder. In the colder months, TMR’s TN186 rates an initial seal sprayed straight onto the prepared gravel no higher than medium risk, while a seal over a prime is rated like any other seal, as in the tables above; the rain risks apply to both. Still deciding whether to seal? See gravel or spray seal. For the service itself, see how we seal driveways and rural roads on the Sunshine Coast.
Braking, accelerating and turning tyres dislodge stone, and conventional bitumen seals resist that shear poorly. Plan the seal for a time when heavy turning traffic can stay off it while it beds down. For yards, farm roads and reseals, see bitumen spray sealing.
For a prime and seal on a new base, Austroads says the pavement must be dry, results are best in dry, warm conditions, and rain can wash uncured primer off. Build weather days into the stage program. To see the work on the day, read how a road or driveway is spray sealed. Send your plans for a quote: see our primes and primer seals service.
On TMR works, MRTS11 (July 2025) sets the temperature and weather limits for sprayed treatments other than emulsions, and MRTS12 (November 2018) covers emulsion seals. TN186 (August 2019) adds the month-by-month cold-weather risk method. Councils and other road owners that use TMR’s documents decide for themselves how cold-weather sealing is managed.
For council or civil work, check which specification and annexure your contract calls up; the months and limits come from there. See also engaging a bitumen spraying subcontractor, or send your spec or tender.
The season can change what goes into a seal, and that can show on the quote. In wet or damp conditions TMR suggests considering emulsion binders or double/double seals, and Austroads notes that emulsions carry a higher cost because of the emulsifying process.
When you get a quote, ask whether a weather day changes anything, and whether any base repairs or patching are needed before sealing.
This guide gives no prices. For the cost drivers, see what drives spray seal costs or, for a home or acreage drive, what affects the cost of a bitumen driveway.
No single month suits every district. On TMR’s cold-weather ratings (TN186), coastal stations from Brisbane to Bundaberg are low risk from October to April, and most inland stations from November to March. Within those months rain decides the day, and December to March is the wetter stretch on BoM averages. See our service areas for the districts we cover.
For a spray seal, the rain risk is before the stone is rolled in and in the first days after, especially in cold weather. On an initial seal, rain soon after sealing can bury or strip stone and emulsify the binder. Much of the “24 hours” advice online is written for painted sealcoat products. For driveway work, see our Sunshine Coast sealing page.
Not on a wet surface. On TMR works there is no spraying during rain or if rain is likely before the stone is spread and rolled, and a seal sprayed on a wet surface is rejected. A light watering of a dusty surface just before spraying is normal. This answer is for spray seals; bitumen vs asphalt compares the two surfaces.
TMR sets its minimum on the pavement surface temperature, and TN186 notes that hot binder cools to it very quickly. TMR’s defaults for its own works are above 10°C for primes and emulsion seals, 15°C for initial seals with AMC5 or AMC6 cutback, 20°C for standard bitumen and 25°C for most polymer modified binders, for an hour before spraying. Your job’s specification can differ. See bitumen spray sealing.
Under TMR’s defaults for its own works: not on a wet surface, when rain is likely before the stone is rolled, in winds over 30 km/h, or before the surface has been above its minimum temperature, and stable or rising, for an hour. Your job’s specification can differ. In the colder months, a forecast of air below 10°C or rain in the week after sealing calls for extra measures or approval on TMR roads. Unsure about a date? Contact us.
It depends on the district. On TMR’s ratings, cold risk rises from May at most coastal stations and from April at most inland stations, and peaks in July, rated high risk at every station. TMR rates initial seals (sprayed straight onto an unprimed base) no higher than medium risk in those months; a seal over a prime is rated like any other seal. If the window is closing, book an on-site assessment to plan the job into the next one.
No. Rain soon after sealing raises the risk of stripping, especially in cold weather. On an initial seal it can also bury stone and emulsify the binder, and on a primed base it can wash uncured primer off. Emulsion seals are vulnerable to traffic if rain falls within a few days, and they gain strength more slowly when it is cool. For primerseals, see primes and primer seals.
All checked 25 September 2026.
Plan your seal with Cuzkell
Based in Cooroy, working across the Sunshine Coast, Noosa and Gympie, Moreton Bay, Brisbane north, the Fraser Coast, the Burnetts, Bundaberg, Toowoomba and the Western Downs. See our service areas. Monday to Friday, 6am to 6pm. Phone (07) 5447 6619.
Office: 07 5447 6619
Anthony: 0427 890 222
Joel: 0428 896 333
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