A hard court typically needs 2–4 hours to drain after light rain (under 0.10 inches) and 4–8 hours or more after heavier rainfall. Playable flags sessions as not playable if 0.10 inches or more of rain fell in the prior 12 hours — the threshold where most hard courts still show wet patches or slick surface film at 7 AM.
0.10
inches (prior 12 hours)
Playable marks sessions not playable if 0.10+ inches fell in the prior 12 hours; borderline at 0.05–0.10 inches.
Hard courts are slightly porous and sloped — typically 1% grade from center to edge — to direct water toward drainage channels. After rain stops, water moves off the playing surface through gravity and drainage infrastructure. How quickly this happens depends on the rainfall total, the court's drainage quality, ambient temperature (faster evaporation in heat), and whether low spots or surface cracks pool water.
Hard courts (the most common in the US) dry fastest — typically playable within 3–4 hours after light rain in warm weather. Clay courts retain moisture in their porous, compacted surface and need significantly more time — often 6–12 hours after meaningful rainfall, plus manual preparation. Grass courts are the most rain-sensitive: they become slippery from morning dew alone and are typically unplayable for at least a day after any significant rainfall.
Playable's 12-hour lookback window captures the key overnight period for morning players. Rain that ended at midnight will have had 7 hours to drain by a 7 AM session — typically enough for most hard courts after light rain. Rain that ended at 5 AM will have had only 2 hours — almost certainly still wet. The total accumulated amount matters as much as when the rain ended.
Even with a forecast, a quick visual check before starting is always worth it. Signs courts are not ready: standing water in service box corners or along the baseline, dark wet patches on the playing surface, the baseline feels soft or slightly spongy underfoot. A quick shuffle test along the baseline — can you slide? — tells you whether footing is safe before you start a point.
Drainage quality
Well-maintained courts with proper slope and functioning drainage clear faster than flat or aging courts. Know your regular courts — some drain in 2 hours, others take 5 for the same rainfall.
Post-rain temperature
Warm, sunny weather after rain accelerates evaporation significantly. Cold or cloudy post-rain conditions slow drying considerably, especially on courts in shade.
Court orientation and shade
Courts in full morning sun dry faster than shaded courts. North-facing courts in shade can retain moisture all morning even after light overnight rain.
How Playable handles this
Playable checks the prior 12 hours of precipitation — not whether it's currently raining — and evaluates it against observed court drainage thresholds. Sessions where 0.10+ inches fell are flagged not playable; 0.05–0.10 inches earns a borderline rating. This is the most relevant rain signal for morning tennis players.
Playable gives you a 7-day playability forecast for your specific court. Free, no account needed.
Check This Week's Conditions →