A six-week hike on the Pacific Crest Trail, starting at the US-Mexico border on June 6, 2006, sounded hot and dry to me. But fifteen years ago I had no experience with southern California or deserts generally, so I didn’t know how to properly prepare my gear, supplies and skills.
What clothing, sleeping bag, and shelter should I use? What foods would be most heat-resistant, and how much water capacity should I have? And what measures could help reduce the sting of scorching mid-day temperatures?
Not knowing where else to get information, I sent questions to the PCT-L, an online email list that at the time was the premier source of news, conversation, and advice about the Pacific Crest Trail.
Ten minutes later, a member pointed me to the Western Regional Climate Center (now part of the National Centers for Environmental Information), which had what I needed. His answer did not give me the specific information for which I’d hoped, but the learned self-reliance served me better for every trip thereafter. Give a man a fish and you feed him for the day. Teach a man to fish and you feed him for a lifetime.
I’ve written before about the importance of researching likely conditions, and the exact conditions to research. I’ve also shared a sample conditions assessment. In this post I want to highlight the resources on which I rely most heavily and regularly.
NCEI and NWS
In the United States, historical temperature and precipitation data can be obtained from the National Centers for Environmental Information (NCEI), specifically using the “Climate Normals 1981-2010” database.
The website could be more intuitive, but it’s functional. Watch this video step-by-step instructions.
NCEI is best for far-out planning. Starting 7-10 days out from a trip, switch to the National Weather Service (NWS) to better tailor your preparations, following the instructions in the same tutorial.
For years I obtained sun and moon data from the US Navy. But it shut down this service, so now I rely on TimeAndDate.com.
Find sunrise and sunset here.
And the moon cycle here.
CalTopo and GaiaGPS
CalTopo started as a desktop-first mapping platform and later launched an app. It remains dominant for at-home trip planning and map printing. Gaia GPS started as a mobile app, and built functionality into its website afterwards. Its best use is still in the field.
A subscription to both platforms is ideal. But if you want to use just one, select the platform that is strongest on your device-of-choice. Personally, I lean towards CalTopo because I plan my trips at home on my desktop computer and because I prefer paper maps in the field. If you’re more mobile-based, then Gaia GPS would be the better pick.
Both platforms will give you access to topographic maps, satellite imagery, and various other data layers (e.g. snow coverage, active and historical fires, slope aspects, and more), which can help inform your research on:
- Navigational aids
- Water availability
- Sun exposure
- Natural hazards like avalanches, river fords, high altitude, wildfires, and lingering snowfields
To best understand where there’s snow right now, use the aforementioned snow satellite layers in CalTopo and Gaia. Another useful platform with this data is snowEvaluator.
But to best understand the state of the current snowpack and how it compares to historical norms, other resources are needed.
If your route involves un-bridged crossings of creeks or rivers that could be hazardous, check the flow levels of those creeks or rivers, or nearby creeks or rivers that probably share a similar pattern.
In most of the US, the best resource is the National Water Information System from the USGS.
California has its own river monitoring program. In an earlier post I linked a half-dozen representative monitoring stations for the High Sierra.
Land agencies, trail associations, and public services
Information from these resources tends to be more conservative, by-the-book, and safety-minded than what you’ll find elsewhere. It’s also official or quasi-official, and it shouldn’t be discounted.
The comprehensiveness and quality of information on land agency websites varies tremendously. In general, heavily visited areas like Yellowstone get more attention than lesser known spots like Kobuk Valley. On the best maintained sites, you will find information about:
- Overnight food storage regulations,
- Trail and trailhead descriptions,
- Updated trail conditions, hazards, and closures
- General backcountry descriptions
- Natural history, including climate zones and geology
Trail associations like the Colorado Trail Foundation are another good source for official regulations and trail-tested guidance, though for a very specific backcountry experience.
Finally, there are avalanche information centers like the CAIC for most western US states. This hazard is not usually a consideration for 3-season backpacking, for anyone wandering mountainous backcountry during the winter it most definitely is.
Print and online guides
Today a handful of authoritative guidebooks are still available only in print form. Secor’s The High Sierra, Roper’s Sierra High Route, Kelsey’s Wind River Mountains, Pallister’s Beyond Trails in the Wind River Mountains, Allen’s Canyoneering 3, and Roach’s Colorado’s Indian Peaks come to mind. Copies of each still are on my bookshelf because no better reference exists.
But it’s a decreasing number, as online sources — like the Guthook app, AllTrails, High Sierra Topix, and my own guidebook downloads — chip away at the exclusivity of older printed content, create new backcountry experiences for a digital generation, and offer more updated (and even real-time) information.
A pre-trip perusing of these texts, maps, water charts, and datasheets will often turn up information or tips about:
- Navigational aids
- Water availability
- Problematic wildlife
- Natural hazards
Forums, blogs, YouTube, and social media
Digital platforms have grown tremendously, both in their gross quantity and their output. I don’t think it’s a stretch to say that today you could fully prepare for an Appalachian Trail thru-hike without looking anywhere else besides YouTube!
The downsides of everyone having a microphone are that (1) the signal-to-noise ratio is poor, and (2) the credibility of the source is not necessarily guaranteed. So consume carefully those trip reports, gear reviews, skills advice, and gear list shakedown comments.
Some channels like the JMT Facebook Group focus on a particular area, trail, or route, whereas others like r/Ultralight stay broad. Google will be your best friend in finding channels that are relevant to your itinerary.
Online resources have made it easier and faster to research the likely environmental and route conditions on your backpacking trip. This is where I start, and it’s how I get three-fourths of the way there.
But to fill in the gaps and to confirm information that I’ve found but don’t entirely trust, I rely on direct conversations with people who have valuable first-hand information but who may not have shared what they know (or everything they know) in a public place, like about an unmapped spring, a fast game trail, a strong tidal current, or the technical difficulty of a dicey-looking pass.
Prior to past trips, I’ve called and emailed park rangers, previous hikers, experienced locals, nearby gear shops and guides, lodge owners, trail stewards and trail angels, bush pilots, village elders, postmasters, and chambers of commerce. Get creative here, and keep dialing until you learn what you need to know.
As someone who occasionally is contacted as one of these resources, I’d advise that you do some homework before making contact. I almost always respond to a well informed inquiry, but I almost never respond to someone looking for basic information that could have been answered in seconds with a Google search.