Can someone do a Nazarite vow today?

Answer From The Annual Reading Schedule - Week 32 Notes For Numbers: I don't see how this is possible. Offerings are required when the vow ends and if someone dies near you unexpectantly, for example, certain offerings are required. Without a functioning priesthood of the Sons of Aharon (Aaron) and a functioning Set-Apart Place (Temple) in Yerushalayim (Jerusalem), you can't meet all the full requirements of the vow. In the case of a serious vow like this, I don't think you should "half-way" do it.

There are times when parts of commandments can be individually done even if other related parts can't – such as the Feasts. We can't do the offerings for the Feast of Sukkot, for example, but we can do the other parts of the Feast such as dwelling in a Sukkah, rejoicing for 8 days, having a Miqra Qodesh (Set-Apart Gathering), and resting on the 1st and 8th Last Great Day. However, in the case of the Nazarite vow I think this is different because it is a very serious vow that tells you from the onset there will be offerings required when it ends. I don't think we should undertake a vow that will require additional offerings that otherwise would not have been required if we had not taken that vow.

So the main difference I see between the Nazarite vow and, for example, the Feast of Sukkot (just to give one example), is that the offerings for Sukkot are required NO MATTER WHAT WE DO… and yet we cannot do the physical offerings…. Whereas the offerings for the Nazarite vow are only required IF WE MAKE THE DECISION to take that vow…. And yet we cannot do those physical offerings either. So there is a difference, in my opinion; and for these reasons I would advise that nobody should be taking Nazarite vows at this time. You can choose to follow the rules of a Nazarite voluntarily, if you want (like avoiding wine, strong drink, etc. as listed in Numbers 6), but I would not make it an actual vow since you can't complete what's required at the end of it or if it is broken. Ecclesiastes 5:5 puts it well:

Ecclesiastes 5:5 It is better not to vow than to vow and not pay

In addition, when I say "you can choose to follow the rules of a Nazirite voluntarily" – I mean – excluding the growing hair requirement. 1 Corinthians 11:14 makes it clear men should not do that. So if you haven’t taken that vow, men should keep hair short as 1 Corinthians 11:14 teaches. I do not believe we should take that vow, however – which means men should keep hair short.