Yeah, nice work, Hawk.
Great opening line (although I prefer 'ageing' with the 'e'!) – and a good line to finish – and the bit in the middle's not bad either!
There's something a bit too chirpy about this line – and you're repeating 'haste' (line 3) – which marks something of a change of tone:
A hasty breakfast fortifies the soul
I'm not sure about 'cot' because of its associations with an infant's bed – and my dictionary tells me a 'cot' is the shack itself, or a cottage, rather than the bed, if that was the sense in which you intended it.
brushed by sun’s first morning ray,
I would keep 'brushed' but change the rest – 'brushed' sounds original; the rest a bit clichéd to be honest.
And I'm sorry to do this – and I might as well apologise to everyone who's work I tinker with in this way, now and in the future! – but I do think it looks a bit messy on the page with all the variously-sized stanzas. Coincidentally (?) it can be made into two 14-line stanzas. The point of doing this in the context of this poem is that you don't want the distractions of jumping between the stanzas – just let it flow and keep the reader reading. Any sudden appearances of new scenes the reader can imagine for him/herself without having to put bits in a separate stanza. The content of the poem describes scenes of natural beauty, so why not reflect this and make the form and shape of the poem aesthetic also?
Overall, it's a good poem and you're on a winning theme. Maybe a bit more in the way of 'writing for the senses' would help – let us really smell the cold, feel the night, hear the footsteps, &c…
The night is aging when we wake.
Hauled from our cots within the shack,
we dress in haste to beat the dawn
and counter winter’s chill.
A hasty breakfast fortifies the soul
and then, with fully laden pack,
we set out in the dark.
In staggered teams,
strung out,
snaking upwards,
along steep, narrow tracks
through densely wooded slopes,
ever higher, always climbing,
reaching for the light.
At last, the sky.
We leave the prison of the trees
and catch a glimpse of heaven.
Before our eyes, a perfect liquid mirror.
Flawless in reflection,
tinted rose, brushed
by sun’s first morning ray,
the snowy hills expand,
growing through opposing planes
divided by the shore.
Breathless as the wind,
we pause and marvel at perfection,
and then we leave.
Only memory remains.