Why is it 休暇で and not 休暇に?


I'm wondering why we use で with 休暇 and why it can't be に like in 夏休みに.

Update: In the sentence,「私たちは **休暇で** ここに来ました。海辺のホテルに泊まっていました。」, I wondered
why they used で instead of に.




I see no evidence for what you suggest. Do you have the full sentence that you
are referencing?

[See here for example using
に](https://ejje.weblio.jp/content/%E4%BC%91%E6%9A%87%E3%81%AB%E5%85%A5%E3%82%8B)

Edit: As I was getting downvotes, I've decided to copy/paste my answer here.

休暇で means 'for break/for vacation', rather than 'during (on) break/during (on)
vacation'. 私たちは休暇に入りました would be 'We went on vacation.'. This would be the
same structure as in the example link I posted 休暇に入る, to enter a vacation
period. As I haven't studied the language in a while (just used it daily), I
can't explain the difference well grammatically. Go to ejje.weblio.jp/sentence
and type in 休暇で and 休暇に and it will give you many example sentences. Learning
by real usage is usually the best way to get it to click.

That being said, 休暇中に might be easier to use for 'during the break'.

