California’s most famous backpacking routes don’t sell out — they lottery out. Nearly every high-country trailhead in the state runs on a quota system that limits how many people can start each day, and the difference between hiking and staring at a full calendar is knowing which agency runs which system and when the booking window opens. Here is how each major system works, drawn from the agency rules cited on each trip’s permit page.
How do trailhead quotas work?
A quota is a daily cap on the number of people entering the backcountry through a specific trailhead. Quotas exist to limit crowding and ecological damage, and they apply during a defined season — roughly late May through late September in most of the Sierra. When the quota season is active, you need a wilderness permit that names your entry trailhead and start date. Permits are largely free; the cost is the competition, not the fee.
Which booking system does each agency use?
| Agency | Example routes | System | When to book |
|---|---|---|---|
| Inyo National Forest (USFS) | Mt. Whitney, Little Lakes Valley, Duck Pass | 60% of quota six months out, 40% two weeks out, 7 a.m. PT on Recreation.gov | Six months ahead, to the day |
| Yosemite National Park | Clouds Rest, Glen Aulin, Lyell Canyon | Lottery 24 weeks ahead; leftovers released weekly seven days out | Enter the lottery, then retry weekly |
| Sequoia & Kings Canyon (NPS) | Rae Lakes Loop, Black Rock Pass | Advance reservations on Recreation.gov during quota season | Months ahead; walk-ups only if quota remains |
| Lassen Volcanic NP | Snag Lake Loop | Free online reservation, no quota, up to 90 days ahead | Up to 90 days out — easy |
| San Gorgonio Wilderness (SGWA) | Vivian Creek, Forsee Creek | Free permits with daily quotas at permits.sgwa.org | In advance; one reservation covers up to 12 |
| BLM King Range | Lost Coast Trail | Permits year-round via Recreation.gov; summer dates quota-limited | Ahead of time for summer weekends |
| Catalina Island Conservancy | Trans-Catalina Trail | Free hiking permit (safety registration), no quota | Online in advance or at the Avalon trailhead |
How does the Inyo 60/40 release actually work?
Inyo National Forest splits every trailhead quota into two pools. Sixty percent becomes reservable exactly six months before your start date; the remaining 40% is held back and released exactly two weeks before, also at 7 a.m. Pacific. That two-week release is the best-kept secret in California backpacking: popular Eastern Sierra trailheads that sold out in seconds six months out routinely have space on a Tuesday morning two weeks ahead, because most people only remember the six-month window. Set a calendar reminder for both dates if you have flexibility.
What about the Mt. Whitney lottery?
The Whitney Zone — the summit route via Mt. Whitney Trail — has its own lottery because demand vastly exceeds supply. The lottery runs February 1 through March 1 each year for dates May through November; you rank preferred dates on Recreation.gov and results post in early spring. Unclaimed dates then flow into the standard Inyo 60/40 schedule. If you strike out on the summit route, the same permit system covers spectacular non-summit trips from nearby trailheads, and late-season weekdays have meaningfully better odds than August weekends.
Can I just show up and get a walk-up permit?
Sometimes. Sequoia & Kings Canyon issues walk-up permits whenever quota remains, which happens on weekdays, in September, and after cancellations. Yosemite’s weekly seven-day release plays the same role. The reliable walk-up era, however, is over for marquee trailheads — treat walk-ups as a bonus, not a plan.
What are the tricks that actually improve your odds?
- Start midweek. Saturday quotas sell out first everywhere; a Tuesday start can halve the competition.
- Aim early or late in the season. Late June and late September have real weather windows and far more availability than the July–August peak — just verify the snow line on the trip page first.
- Target the two-week or seven-day releases. Set alarms; they are the highest-yield minutes in California backpacking.
- Have a basin, not a route. If Piute Pass is taken, the neighboring Inyo trailheads in the same region open nearly identical country.
- Book the people, not the plan. Permits cap group size (typically 8–15 depending on agency); lock the date your whole group can commit to before entering any lottery.
What do I need before I sit down to book?
Five minutes of preparation is the difference between a booked permit and a sold-out screen:
- Trailhead name — the exact entry trailhead, not the region (“Mosquito Flat”, not “Rock Creek”).
- Start date plus one or two alternates — midweek dates fail less.
- Party size — quotas count people, not tents; a group of 8 needs eight times the quota space.
- An account on the booking system — Recreation.gov accounts and login friction are real at 6:59 a.m.
- A fallback basin — the neighboring trailhead you’d accept.
How do group size limits work?
Every agency caps group size, typically 8–15 people depending on the wilderness, and the cap applies to the quota as well: a family of six consumes six of that trailhead’s daily spaces. For popular trailheads, small groups win — a pair has an order of magnitude more date options than a group of ten. If you’re planning a large group trip, target no-quota areas (Lassen’s backcountry has no quotas at all) or book far ahead for the few sites designed for groups.
What happens if my plans change?
Policies differ by agency, but the pattern is consistent: cancellation releases your spaces back into the system, and on Recreation.gov you can cancel yourself (minus a small fee), which is exactly how late-season availability appears for everyone else. If you no-show, the spaces go unused — the few systems that penalize no-shows do so by suspending booking privileges. The courteous move, and the community-sustaining one, is to cancel the moment you know you can’t go.
Do I need a permit in winter?
Generally the quota season — and its booking scramble — runs from late spring through early fall. Outside quota season, many areas shift to self-issue or free permits, and some simply require the same free registration. Winter travel, though, swaps quota competition for real avalanche and navigation risk, which is beyond what a permit page can manage for you. The rule of thumb: check the trip page’s agency link for the off-season process, and treat winter trips as a different sport with the same trailhead.
A worked example: getting a summer permit for the Eastern Sierra
Suppose you want the North Lake–South Lake loop starting Saturday, August 8. The naive plan — book August 8 as soon as it opens, six months out on February 8 at 7 a.m. — is exactly what everyone else does, and Saturday quota for the most popular Bishop Creek trailheads goes within minutes. The realistic plan: enter the queue on a weekday date (Tuesday, August 4), accept the neighboring trailhead in the same basin if North Lake is gone, and set a second alarm for the 40% two-week release on July 28. This is also why the site shows each trip’s agency prominently — the release calendar, not the trail, is what you’re really planning around.
What if everything is sold out?
Sold out is a moment, not a season. The stock always moves: cancellations release spaces continuously, and the agencies’ scheduled re-releases (Inyo’s 40% at two weeks, Yosemite’s weekly seven-days-out drop) put fresh quota into the system on a clock. The playbook:
- Recheck the booking page at odd hours — cancellations land 24/7, and a Wednesday-morning refresh beats a Friday-night fantasy.
- Walk up midweek — Sequoia & Kings Canyon still issues walk-ups when quota remains, which in September is often.
- Shift the trailhead, keep the basin — neighboring entries in the same high country offer nearly identical trips with separate quotas.
- Shift the trip type — Lassen’s no-quota backcountry and Catalina’s free registration are permanent fallbacks that nobody brags about and everybody should.
The five-step booking checklist
- Pick three candidate trips in the same region with matching season windows.
- Note each one’s agency, quota rule, and reservation window from its trip page.
- Calendar both releases (six-months-out day, and the two-week or seven-day re-release).
- Book midweek inside the season window at 7 a.m. PT sharp; have party size and alternates ready.
- Cancel promptly if plans die — the spaces you release are the ones you’ll harvest next time.
Where do I see the permit rules for a specific trip?
Every CaliPeaks trip page lists the managing agency, the exact quota rule, the reservation window, and a direct link to the official booking page — with the source and access date cited. Check it before you plan around a trailhead, because windows and quotas are adjusted by the agencies from year to year.