На насте нужны снегоступы.

Наст is a layer of hard, crusted snow that forms on the surface after thawing, wind, or refreezing. So на насте means on crusted snow or when the snow has a hard crust.

This is a fairly specific winter/outdoors word, so many learners will not have seen it before.

Because на here means on in the sense of location/surface, and with that meaning it takes the prepositional case.

• наст = dictionary form, nominative singular
• на насте = prepositional singular

So the pattern is:

• на снегу = on the snow
• на льду = on the ice
• на насте = on the snow crust

If на meant motion onto something, you would normally expect the accusative, but here it is about being or moving on the surface, so prepositional is used.

Because нужны agrees with снегоступы, which is plural.

• нужен = needed, masculine singular
• нужна = needed, feminine singular
• нужно = needed, neuter singular
• нужны = needed, plural

Since снегоступы is plural, Russian uses нужны:

• Снегоступы нужны. = Snowshoes are needed.

In this construction, the thing that is needed is treated grammatically as the subject, so it stays in the nominative:

• нужны снегоступы = snowshoes are needed

English often uses a different structure, but in Russian this is normal.

Compare:

• Мне нужны снегоступы. = I need snowshoes.
  • мне = to me
  • снегоступы = nominative plural subject
  • нужны agrees with снегоступы

So Russian is closer to Snowshoes are necessary (for me) than to a verb like I need.

Because the sentence is making a general statement, not saying who specifically needs them.

На насте нужны снегоступы means something like:

• On crusted snow, snowshoes are necessary
• When there is a hard snow crust, you need snowshoes

If you want to say who needs them, you can add a dative pronoun:

• Мне на насте нужны снегоступы. = I need snowshoes on crusted snow.
• Вам на насте нужны снегоступы. = You need snowshoes on crusted snow.

Without that pronoun, it sounds more like a general rule or observation.

The core structure is:

• снегоступы нужны = snowshoes are needed

Then на насте adds the condition or setting:

• На насте нужны снегоступы.

So literally it is something like:

• On crusted snow, snowshoes are needed.

This is a common Russian pattern:

• В горах нужна осторожность. = In the mountains, caution is necessary.
• Зимой нужны тёплые ботинки. = In winter, warm boots are needed.

Russian word order is flexible, and the first position often gives the context or topic.

Putting На насте first means:

• first set the situation: on crusted snow
• then give the main point: snowshoes are needed

So it sounds natural and informative.

Other orders are possible, for example:

• Снегоступы нужны на насте.

This is also understandable, but it puts slightly more focus on снегоступы first. The original version feels like In those conditions, this is what you need.

It is really about conditions, not just physical location.

На насте literally means on the crust, but in practice the sentence means:

• when walking on crusted snow
• in crusted-snow conditions

So even though the grammar is locational, the sense is broader: it describes the kind of terrain or snow surface where snowshoes are necessary.

Yes, but the structure would be different.

You could say:

• На насте нужны снегоступы. = Snowshoes are needed on crusted snow.
• На насте надо идти в снегоступах. = On crusted snow, you need to walk in snowshoes.
• На насте надо снегоступы. is less standard in careful Russian than нужны снегоступы.

So нужны снегоступы is a very natural way to say that snowshoes are necessary.

Yes, it is the normal word for snowshoes.

It is formed from:

• снег = snow
• ступать / ступа / ступ related to stepping

So the idea is something like devices for stepping on snow.

The singular is:

• снегоступ = a snowshoe

The plural is much more likely in real life, because people normally talk about the pair:

• снегоступы = snowshoes

Not very naturally. A very literal version would be:

• On the crust, snowshoes are needed.

That is understandable, but English usually prefers something smoother, such as:

• You need snowshoes on crusted snow.
• Snowshoes are necessary on crusted snow.

So the Russian grammar is straightforward, but the most natural English translation may use a different structure.