Use Tryndamere's medium early agency and scaling strength to pressure Garen and deny him a passive lane state.
Focus on splitpushing and extended side-lane duels where (R) and Fury sustain outmatch Garen's short trades.
Trading pattern
Stack Fury through wave clear, then use (E) to close distance only when (Q) silence is on cooldown to avoid being silenced.
Extend trades with (R) when Garen cannot disengage, punishing his lack of mobility and limited range.
Avoid trading when Fury is low or (R) is unavailable, as Garen's short trades and execute become more threatening.
Danger windows
Be cautious when (Q) silence is available, as it can deny your (E) engage and (W) slow, increasing his short trade threat.
Avoid extended fights without (R) active, since Garen's execute and sustained damage from (E) can overwhelm you.
After using (E) aggressively, be wary of being kited or collapsed on due to lack of mobility until it resets.
Early game
Build Fury early by controlling the wave to enable strong trades when (Q) silence is down.
Avoid engaging with (E) unless you have Fury stacked and can chase, as Garen's silence punishes premature all-ins.
Use (W) slow to reduce Garen's damage output and create safer windows for short trades before level 6.
Power spikes
At level 6, use (R) to force extended all-ins and convert low-health trades into kills or tower pressure; respect Garen's execute (R) by avoiding fights when your health is low.
Two-item power spike significantly increases Tryndamere's splitpush threat; leverage side-lane pressure to force Garen to respond.
Respect Garen's level 6 execute window and his first bruiser/tank item spike by avoiding prolonged trades and punishing cooldowns before these spikes.
Win conditions
Build Fury and control the wave to enable strong trades and safe (E) engages when (Q) is down.
Use (R) to convert low-health fights into kills or tower dives, leveraging Tryndamere's death denial.
Apply side-lane pressure post two-item spike to force Garen to answer, creating map pressure and enabling splitpush victories.
Tip: For Tryndamere vs Garen, read overview, trading pattern, and danger windows first for a fast Top lane check.