depends on what Pokemon you want to evlove. Bug and grass type evolve the earliest and dragon types evolve the latest. Tell me what Pokemon you wanna evolve then I'll give you the answer. this answer is retarted.
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That's completely incorrect; and that's also not even what the original poster asked. Disregard the answer above.
Eevee doesn't evolve at a certain level, into Umbreon, or any other Eeveelution. They all evolve under different circumstances, regardless of what level they are at. You can evolve an Eevee at level 1, or at level 99. It's up to you.
To evolve an Eevee into an Umbreon, you must first have your Eevee at a high happiness rating. After you know it's at high happiness, wait til night time, (I believe the time frame is from 8:00pm to 4:00am,) and level it up. It will evolve into an Umbreon.
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To make Eevee evolve into an Umbreon, you have to level it up with high happiness at night.
Eevee doesn't have a set level to evolve into Umbreon. All you have to do to evolve it is max out its happiness at night. ~KKMG1
Make Eevee as happy as you can. For Umbreon, level it up at night. For Espeon, level Eevee up in the day.
You will need to have your Eevee to full Happiness, then level it up at least once during the night to evolve it into Umbreon.
you have to level him up at night