Why don聮t you just bike around La Grande right now? When it聮s YOUR winter? Why go all the way to New Zealand for somebody ELSE聮S winter. Maybe because in La Grande it easily drops into the teens with snow to match, whereas in New Zealand you聮ll generally be above freezing.
Black Diamond Lighthouse Tent

Anyway, several tents will work. First, though, the philosophical stuff. Weight matters a bit less when biking because you have a better mechanical advantage thanks to the gears. That聮s especially true when pulling a trailer; it聮s easier to haul a load in a trailer than to load it on your bike. But sure, weight matters. Especially if you want a tent to take hiking. The other thing is, tents really aren聮t 聯warm,” as such. They simply have more or less ventilation.
So, if it were me, I聮d probably take a Black Diamond Lighthouse ($379; bdel.com). It聮s a three-season tent that seals up well enough for blustery weather, and it weighs only 3 pounds, 12 ounces. It can fit two people, meaning you聮ll have lots of space for yourself, or room for a guest, should you need it. It聮s a light, single-wall tent made from a material called Epic, which is a little bit breathable and offers plenty of rain-resistance. It聮ll work great on your bike trip, then make the transition nicely to backpacking.
I also like Marmot聮s EOS 1P ($225; marmot.com), which is a solo three-season tent. It聮s a more traditional design聴you pitch the canopy, which has some mesh in it for ventilation, then you toss a fly over that to keep out rain and some wind. It聮s even lighter than the Lighthouse, around three pounds, which is fantastic. It聮s smaller, of course. And it might be a little drafty when the wind is up and temps are near freezing. Then again, you should be able to find sheltered spots in which to pitch it.
For a really, truly weatherproof tent, take a look at Mountain Hardwear聮s Spire 2 ($425; mountainhardwear.com). It聮s a true mountaineering tent with very rugged construction, a full-coverage fly, and a canopy that buttons up tightly. Weight, at five pounds, is pretty good. But I think it聮s more than you need. Really, I聮d take a Lighthouse.
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