Choosing when to start your Pacific Crest Trail thru-hike isn’t just about picking a date that works with your schedule. The 2,650-mile trail from Mexico to Canada operates within a narrow weather window, and your start date will determine whether you face snow-covered mountain passes, dangerous heat, or wildfire closures. This guide breaks down everything you need to know about PCT timing to help you plan a safe and successful thru-hike.
Understanding the PCT Hiking Season
The Pacific Crest Trail has a limited hiking window dictated by two critical factors: snow in the mountains and your direction of travel. Unlike trails you can hike year-round, the PCT becomes impassable in winter and presents serious challenges outside the traditional season.
The basic season breakdown:
- Northbound (NOBO) hikers: Start late March through May
- Southbound (SOBO) hikers: Start mid-June through July
- Total hiking time: 4-6 months for most hikers
The Permit Lottery and When You Can Start
Before you can set foot on the trail, you need to secure a PCT long-distance permit through the Pacific Crest Trail Association (PCTA). This free permit is required for anyone hiking 500+ consecutive miles and covers wilderness permits across the entire trail.
Permit release timeline:
- First registration period: Usually opens in late October (about 10 days)
- First permit release: Mid-November (35 NOBO permits per day)
- Second registration period: Opens late October/early November (runs through mid-December)
- Second permit release: Mid-January (15 additional NOBO permits per day, plus 15 SOBO permits per day)
Here’s the catch: you register during these windows, receive a randomized appointment time, then log in on release day to select your start date. Popular dates fill up quickly, especially mid-April starts. If you get an early appointment time, you’ll have better choices. If you get a late time slot, your preferred date might already be taken.
The permit system exists to spread hikers out and protect the trail environment. You must start on your exact permit date and location, so choose carefully based on your fitness level and snow tolerance.
Northbound Start Dates: April and May Dominate
Over 90% of PCT thru-hikers go northbound, starting at the southern terminus near Campo, California, and heading toward Canada. The timing challenge? You need to get through the desert before extreme heat arrives, reach the Sierra Nevada mountains after the snow melts, and finish Washington before winter returns.
Early April Starts (April 1-15)
Starting in early April gets you ahead of the pack and through Southern California’s desert before temperatures spike into the triple digits. However, you’ll likely arrive at Kennedy Meadows (the gateway to the High Sierra) by late May or early June, which means significant snow in the mountains.
What you’ll face:
- Moderate desert temperatures (80s-90s°F)
- Possible snow in Southern California mountains (San Jacinto, Mt. Baden-Powell)
- High Sierra arrival during peak snowmelt
- Deep snow on mountain passes above 10,000 feet
- Swollen, dangerous creek crossings
- Potential avalanche risk in exposed areas
This start window works best for experienced mountaineers comfortable with ice axes, crampons, and route-finding in whiteout conditions. Many hikers who start this early end up taking extended breaks in towns like Tehachapi or Kennedy Meadows, waiting for snow to melt, or they flip up to Northern California and return to the Sierra later.
Late April Starts (April 15-30)
Late April is the most popular start window and represents a sweet spot for many hikers. You’ll reach the High Sierra in mid-to-late June when conditions are improving but snow still covers the highest passes.
What you’ll face:
- Warming desert temperatures (90s-100s°F)
- Mostly clear Southern California mountains
- Moderate snow in the Sierra (mainly on north-facing slopes and high passes)
- Manageable creek crossings as snowmelt peaks taper
- Arrival in Washington by late August/September
- Good social atmosphere with the “herd” of hikers
This timing requires carrying snow safety gear (ice axe, microspikes) but generally doesn’t demand advanced mountaineering skills in normal snow years. Target finishing the desert section by mid-June to enter the Sierra when conditions are safest.
Early to Mid-May Starts (May 1-15)
Starting in May means better Sierra conditions but more challenging desert hiking. You’ll face serious heat in Southern California but encounter significantly less snow in the mountains.
What you’ll face:
- Extreme desert heat (100s-110s°F)
- Potential water source issues in late spring
- Minimal snow in the Sierra (possibly just the highest passes)
- Clear, stable weather in the mountains
- Compressed hiking schedule to finish before Washington snow
- Smaller crowds but still social
May starters need to hustle through the desert (averaging 20+ miles daily) to reach Kennedy Meadows by late June or early July. The advantage? The Sierra becomes a stunning alpine paradise instead of a snow-slogging challenge. You’ll need sun protection, heat management strategies, and the fitness to sustain higher daily mileage.
Late May Starts: Racing the Calendar
Starting after May 15th is possible but dramatically compressed. To finish by mid-September (before Washington snowstorms), you need to average 25+ miles daily with minimal rest days. This is achievable for fit, experienced hikers but leaves little margin for injury, town temptations, or delays.
Key consideration: Late starters should seriously consider alternative approaches like flip-flopping (starting mid-trail and hiking in sections) or southbound starts.
Why Snow Dictates Your Sierra Entry
The High Sierra section from Kennedy Meadows to Sierra City includes the trail’s highest elevations and most spectacular scenery. It also presents the biggest timing challenge for northbounders.
Critical timeline: Most hikers should not enter the Sierra before June 15th in normal snow years. Early June is the absolute minimum, and mid-to-late June is ideal for most skill levels.
The Sierra has 12 major mountain passes, many above 11,000 feet. In spring, these passes feature:
- 10-20 feet of consolidated snow
- Steep, exposed slopes where falls mean serious injury
- Zero trail markers (the trail is completely buried)
- GPS navigation requirements
- Early morning starts (4-5 AM) to cross on frozen snow
- Afternoon postholing as snow softens
Heavy snow years (like 2017 and 2019) can make the Sierra impassable even in July for most hikers. Many skip the section entirely or wait until late summer to attempt it. Low snow years (like 2018) allow earlier entries with minimal mountaineering gear.
Check current snow reports at Kennedy Meadows and talk to hikers who’ve just finished the section. The two full rest days at Kennedy Meadows aren’t just for relaxation but for gathering intelligence and preparing gear.
When Fire Season Disrupts Your Plans
Wildfire has become the PCT’s biggest unpredictable challenge, especially for hikers in California and Southern Oregon from July through October. Unlike snow, which follows somewhat predictable patterns, fires can erupt suddenly and close hundreds of miles of trail.
The Fire Timeline
Fire season typically intensifies:
- July-August: Northern California fires begin
- August-September: Peak fire season across California and Oregon
- September-October: Southern California fire risk increases
Recent years have seen devastating impacts. In 2024, multiple fires in Washington created a fractured trail with numerous closures. In 2021, California experienced such extreme fire danger that virtually all national forests closed simultaneously in early September, stranding southbound hikers and forcing northbounders to skip massive sections.
Why Earlier NOBO Starts Avoid the Worst
Hikers who start in April reach Northern California and Oregon by July, getting through these fire-prone areas before peak fire season in August-September. Those who start in May typically transit these sections in August, still encountering some fire risk but generally ahead of the worst closures.
Fire doesn’t just mean smoke. Active closures are illegal to enter and extraordinarily dangerous. Wind shifts, spot fires, retardant drops, and trap-door-like charcoal pits from smoldering underground fires create deadly conditions. When fires close sections, hikers must:
- Road walk around closures (sometimes 50+ miles on highways)
- Hitch rides to skip entirely
- Wait in towns hoping for reopening
- Accept their thru-hike won’t be continuous
The PCTA maintains a real-time closure map, but you need to check it regularly and be flexible with your plans.
Southbound Starts: The Solitary Alternative
Only about 10% of thru-hikers go southbound, but it offers unique advantages for those who start hiking in summer.
SOBO start window: June 15 – July 31
The late June/early July timing allows snow to melt in Washington’s North Cascades, which hold snow longer than anywhere else on the PCT. However, permits are extremely limited at just 15 per day.
Why Most People Don’t Go Southbound
Fire season is the biggest reason. SOBO hikers reach Northern California in August-September, entering fire territory at the absolute worst time. Where NOBOs might encounter closures, SOBOs almost certainly will. You’ll arrive at the Sierra in October, which sounds ideal for avoiding crowds and snow, except:
- Smoke from summer fires often lingers into October
- Days are much shorter (10-11 hours of daylight vs. 14-15 in summer)
- First winter storms can hit the Sierra in early October
- Mountain resorts and services close for the season
- You must exit the Sierra before snow returns (target: October 15th)
After the Sierra, you face Southern California’s desert in November. Natural water sources are depleted, temperatures swing from hot days to near-freezing nights, and trail angels stop maintaining water caches.
The compressed timeline is brutal. From Canada to Forester Pass (the Sierra’s southern exit), you have roughly 100 days to cover 1,800 miles. That requires consistent 20+ mile days with few breaks, even through Washington’s demanding terrain at the start.
When SOBO Makes Sense
Consider southbound if:
- You can’t start until late June or July
- You prefer solitude and smaller crowds
- You’re an experienced hiker comfortable with navigation and self-sufficiency
- You can maintain high daily mileage consistently
- You’re willing to accept fire-related route changes
Many SOBOs don’t complete their hikes. Between fire closures, the short window, and challenging logistics, the success rate is significantly lower than NOBO.
Washington’s Snow Deadline: Your Finish Date
Regardless of your start date or direction, you must finish the North Cascades before winter snow returns. This is non-negotiable for safety.
Target finish date: September 15th (absolute latest: October 1st)
Washington has seen snow as early as mid-September, though early October is more typical. When the first significant storm hits, the trail becomes impassable and deadly for hikers with standard thru-hiking gear.
PCT hikers have died during early season snowstorms. The steep, exposed terrain in the North Cascades combined with limited daylight, cold temperatures, and whiteout conditions creates a survival situation, not a hiking challenge.
Working backward from September 15th:
- You need to reach the Oregon/Washington border by late August
- Which means Northern California by early August
- And the Sierra by late June/early July
This is why the April-May NOBO start window exists. It gives you the 4-5 months needed to cover 2,650 miles while working within the safe weather windows.
Making Your Decision
Your ideal start date depends on several personal factors:
Choose early April if:
- You have mountaineering experience and proper snow gear
- You want to avoid desert heat
- You’re comfortable with navigation in snow
- You can handle waiting for the Sierra to clear
Choose late April if:
- You want the traditional PCT experience
- You have moderate snow experience
- You prefer hiking with a “bubble” of other hikers
- You want balanced weather across all sections
Choose May if:
- You’re highly fit and comfortable with sustained high mileage
- Heat doesn’t bother you
- You want minimal snow in the Sierra
- You prefer smaller crowds
Choose SOBO if:
- You can only start in summer
- You prioritize solitude
- You’re experienced with fires and route changes
- You can maintain 20+ mile days from the start
Practical Planning Tips
Monitor snow conditions using resources like Postholer’s PCT snow page and California’s snow water content data. High snow years (150%+ of normal) require later starts; low snow years (60% of normal) allow earlier entries.
Be flexible with your permit date. Have a list of 5-10 acceptable dates before release day. The permit lottery is randomized, so your preferred date might be unavailable. Dates within a week of each other offer similar conditions.
Don’t start too early for your skill level. Just because a permit is available doesn’t mean conditions are safe for you. The PCTA explicitly warns that available dates don’t guarantee favorable conditions for all abilities.
Build buffer time into your schedule for:
- Minor injuries and rest days
- Fire closures requiring detours
- Town visits and resupply delays
- Waiting for water caches or trail conditions
- Simply enjoying the experience
Accept that perfection is impossible. No start date guarantees ideal weather throughout. You’ll face challenges regardless of when you begin. The “perfect” date is the one that matches your abilities, timeline, and risk tolerance.
The Bottom Line
For most new PCT thru-hikers, a late April start (April 15-30) offers the best balance of manageable desert heat, reasonable Sierra snow, sufficient time to finish, and social atmosphere. It’s popular for good reason.
If you’re more experienced or have specific constraints, early April (with snow skills) or May (with fitness and heat tolerance) can work beautifully. Southbound remains an option for summer starters, but expect significant fire challenges and a demanding schedule.
The permit lottery adds an element of chance, so prepare for multiple date options. Study current snow and fire conditions as your start approaches, and be ready to adapt your plans. The PCT rewards flexibility and preparation.
Above all, choose a start date you can commit to safely. This isn’t about machismo or racing other hikers. It’s about spending 4-6 months in one of the most spectacular wilderness corridors on Earth and living to tell about it. Pick your timing wisely, prepare thoroughly, and the trail will deliver an unforgettable experience.