John 6:10 NASB95
Jesus said, "Have the people sit down." Now there was much grass in the place. So the men sat down, in number about five thousand.

Mark 6:39 NASB95
And He commanded them all to sit down by groups on the green grass.

Green grass is rare in the region. The most likely time for the event was March through May, because the prevalent rains were November through March.

Mark 6:31 NASB95
And He said to them, "Come away by yourselves to a secluded place and rest a while." (For there were many [people] coming and going, and they did not even have time to eat.)

John 6:4 NASB95
Now the Passover, the feast of the Jews, was near.

Passover was the biggest festival, which explains the many people coming and going.

John 6:5 NASB95
Therefore Jesus, lifting up His eyes and seeing that a large crowd was coming to Him, said to Philip, "Where are we to buy bread, so that these may eat?"

Luke 9:10-11 NASB95
When the apostles returned, they gave an account to Him of all that they had done. Taking them with Him, He withdrew by Himself to a city called Bethsaida. But the crowds were aware of this and followed Him; and welcoming them, He [began] speaking to them about the kingdom of God and curing those who had need of healing.

John 12:21 NASB95
these then came to Philip, who was from Bethsaida of Galilee, and began to ask him, saying, "Sir, we wish to see Jesus."

Jesus asked Philip where to buy bread, because he was a local.

John 6:9 NASB95
"There is a lad here who has five barley loaves and two fish, but what are these for so many people?"

The barley harvest was right before Passover.

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Bible differences prove its reliability