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Quirrell knew how to get around Fluffy around in April, but he waited until June to try to steal the Philosopher's Stone. Why didn't he try earlier?
I know Voldemort was afraid of Dumbledore, but was it really the first time Dumbledore had left the school since April? Why did he wait to lure him away from the school?
Quirrell himself admits the attempted theft from Vault 713 in the final confrontation:
"When I failed to steal the stone from Gringotts, he was most displeased. He punished me ... decided he would have to keep a closer watch on me." -- Harry Potter and the Philosopher's Stone, Chapter 17 "The man with two faces"
As already mentioned above by Cadence, how to overcome the defenses at Hogwarts was something he first needed to find out:
"You're too nosy to live, Potter. Scurrying around the school on Halloween like that, for all I knew you'd seen me coming to look at what was guarding the Stone." -- Harry Potter and the Philosopher's Stone, Chapter 17 "The man with two faces"
Quirrell's questionable enquiries didn't go unnoticed. Albeit interpreted completely wrong by Harry, the little talk between Snape and Quirrell he overheard documents that at least Snape was aware of Quirrell's snooping:
Snape interrupted him: "Have you found out how to get around the beast of Hagrid's yet?" -- Harry Potter and the Philosopher's Stone, Chapter 13 "Nicholas Flamel"
As Harry and his friends become aware, Quirrell indeed does find out how to calm cute Fluffy:
"Well -- yeah -- how many three-headed dogs d'yeh meet, even around Hogwarts? So I told him, Fluffy's a piece o' cake if yeh know how to calm him down, jus' play him a bit o' music an' he'll go straight off ter sleep --" Hagrid suddenly looked horrified. "I shouldn'ta told yeh that!" he blurted out. -- Harry Potter and the Philosopher's Stone, Chapter 16 "Through the Trapdoor"
It is unclear how much Quirrell found out about the defenses and what was still unknown to him. At minimum he didn't know how to retrieve the stone from the Mirror of Erised. He likely would have preferred to find out still more, but Voldemort, the possibility of the stone being relocated again or even destroyed, and the nearing end of the school year forced him to act.
No one knew how to get past the dog. This was contributed by Hagrid and only he knew how that can be done. That Dumbledore borrowed it was, apparently, a surprise to everyone involved, and quite nasty one to boot. Voldemort finds the solution to that stage much later than he would like, which was, counting backwards, about 4 weeks before the attempt.
Timeline is clear: Hagrid gets Norbert and some time after that Dumbledore is being "called" to London. It logically follows that he was lured out when Voldemort was ready and opportune time came, meaning no more festivities, no more exams and so on, when Dumbledore's presence in Hogwarts wasn't required. After all, Dumbledore is the Head of Hogwarts, if a summons from the Ministry came before then, he would simply decline and reschedule anyway.
Quirell waited because it wasn't the right time to do it yet and also because of Snape remember that one scene in the movie where Snape was talking with Quirell they were more likely talking about the Stone and he waited so long because of Dumbledore he needed to get Dumbledore away from the stone to get it...and also he needed snape away from him to get it but,as we seen in the movie snape wasn't doing that because of snape being snape and also he had Voldemort on the back of his head literally on the back of his head so Voldemort was more likely giving commands.
