Yellowstone and Grand Teton in September

I can’t help you out but I am looking forward to reading replies to your questions! We are also going in September but the opposite way, starting in Jackson and leaving from Bozeman. From what I could gather so far, it seems as though most ranger programs end after Labor Day, but I’m not entirely sure about that.

I'm sure Pam, our Yellowstone expert, will be along shortly to answer your questions

We visited both parks in 2020, so no ranger tours or talks due to COVID restrictions. Old Faithful put on an incredible display while my husband was inside the Inn checking us in. He never did get to see a really good display even though we passed OF many during our stay.

Stop along the way to YNP to pick up a cooler and provisions if you're planning picnics. You'll be able to replenish ice and basic items in the Parks along with Huckleberry ice cream. Don't forget the Bear Spray.

In GTNP, we took the early morning Brushbuck Wildlife Tour in 2020. In 2021 we did a float trip on the Snake River inside GTNP.

Enjoy your trip!

Here are my thoughts:

"*Here are my questions that go beyond food and bear spray!"

1. I'd love recommendations for a wildlife tour for 2 from Mammoth.
->>I'd go with one of the private guides out of Gardiner if money is not an object. I'm getting ready to leave the house for a couple of hours so let me do a search and come back to this later.

2. What is your favorite must-see in each location?
->>On the North end, Lamar Valley certainly. If the afternoons are hot in September, go early as you can while the wildlife are out. They tend to seek shade or higher elevations in the heat. Those big fur coats, ya know.
->> Old Faithful - Predictable geysers Grand and Riverside. My favorite one is Great Fountain but the road back there has been closed the last 2 years as the wimpy, old bridge collapsed and I don't think they are going to fix it. You can walk back in but it's about a mile and I'd not do that to watch sunrise or sunset.
->> Lake - Should be able to get the front desk to tell you where to go for sunrise. Sunset may be good at Lake Butte Overlook but it's about 10 miles east of Fishing Bridge junction so you'd have to drive V-E-R-Y carefully back to Lake.

3. Best sunrise/sunset spots in each location.
-->Sunrise - Mammoth Hot Springs - Upper Terrace Drive looking over the village of Mammoth below and you should be able to see the sun to the East. Old Faithful - Geyser Hill sitting near Beehive Geyser. Sun will come up over your shoulder but should be reflected across the geyser run off areas.

4. What ranger-led tours, talks should we plan to attend?
-->Check with each Visitor Center. They do stop these in Septembers...depends on the contracts they have with Rangers on when their last day is. I've done some as late as the last day of Sept but it will really depend. I expect they are understaffed again this year so they may be gone in early Sept. There is a park newspaper that you will get at the gate and it will have a general outline but the best info will be at the actual VC.

5. Anything else I should know?
--> Be prepared for chilly nights. Have a jacket, warm hat, glove liners, SUN hat, hahaha, sunglasses and sunscreen.

When you are on your way to the park, stop and get a cooler and some supplies. Bozeman, Livingston (Albertsons right after you exit I90) or Gardiner Market (has surprisingly good selection and honestly the prices are no worse there than what I pay in CdA). Depending on exactly when in Sept, some of the food options will start to close so it's better to have provisions for lunches/snacks on hand.

OK....gotta run....I'll be back this afternoon to finish!

Here is a post copied from a friend on Trip Advisor. She has never toured with any of these guides but has seem them all along the Northern Range road/Lamar Valley when she is in the park. She lives in Billings so goes to the park at least monthly during May-October.

"There are lots of great private wildlife tour companies that operate out of Gardiner. I don't have a reason to take a private wildlife tour, but have had the opportunity to observe many of them in action during my multiple trips to Yellowstone Park each year. The following are ones I would recommend that you look at to see if they fit your interests and needs.

Yellowstone Guide (Jort Vanderveen)

https://yellowstoneguide.org/

https://www.facebook.com/yellowstoneguide/

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Yellowstone Wild (Emil McCain)

https://www.yellowstonewildtours.com/tours/

https://www.facebook.com/YellowstoneWild/

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Yellowstone Wolf Tracker (Nathan Varley and Linda Thurston)

https://www.wolftracker.com/index.php

https://www.facebook.com/yellowstonewolftracker/

---

Yellowstone Insight (MacNeil Lyons)

http://yellowstoneinsight.com/

https://www.facebook.com/YellowstoneInsight/"

Yellowstone Forever is the non-profit organization that supports the educational mission of YNP. I've done a number of their Field Seminars over the years and they are quality programs. They were specialist programs focused on either history or birding so I've never done one of their general programs. They do have some wildlife programs a couple of days a week during the summer season.

https://www.yellowstone.org/summer-yellowstone-day-adventures/

There are also Wake up to Wildlife tours out of Mammoth to Lamar Valley run by Xanterra the lodging provider. These would be fine if they are more in your budget and they do run every day.

https://www.yellowstonenationalparklodges.com/adventure/land-adventures/wake-up-to-wildlife/

The wildlife guides are all on radios so they hear what others are spotting and where. The tours don't go any place you can't go on your own. They stay on the paved road or there is an occasional foray down a couple of dirt/gravel roads.

TIMING: I would recommend you do a wildlife tour your first morning after arriving the day before. IF you are not used to spotting wildlife this will help you know where and how to look. It will be early so it depends on where you are traveling from as to whether this will work for you. I'd definitely do it out of Mammoth as this will be to the wildlife-rich area of Lamar Valley. The next day when you are transiting to Old Faithful you can re-drive the same area you covered and see what you can see. Backtracking is not a problem in Yellowstone. When I am staying on the North end, I drive the Northern Range (Mammoth to the NE entrance Road and out the NE entrance road almost to the NE entrance) every day or sometimes twice a day.

RANGER PROGRAMS:

Here also is a link to the 2025 Ranger programs. I have no idea if these will be the same or not for 2026 and they probably don't even know yet. Rangers start arriving to Old Faithful and Canyon for the opening day of the interior of the park which is the 3rd Friday of April and continue to arrive in batches up to the real beginning of the summer season on Memorial Day weekend. They then start leaving in batches, usually Aug 31, Sept 30 and the last ones turn out the lights on October 31.

https://www.nps.gov/yell/upload/2025-YELL-Summer-Ranger-Program-Schedule-Tabloid-11-x-17.pdf

This page should give you a link to the 2026 programs when they are uploaded sometime in April or by mid-May.

https://www.nps.gov/yell/planyourvisit/ranger-programs.htm

Depending when in Sept you will be there, overnight freezing can be expected, especially after the 15th.

If you plan to see sunrise, bring clothes for that weather condition.

If you hike, Observation Point Trail is a great place to view Old Faithful.

Looking at the falls at Canyon seems like it would be a nice view of the sunset. I've never tried it, though. You will have a great sunrise view at Lake.

At that time of the year the Grand Prismatic Overlook Trail will be open, and I think it's a don't miss location. After you are done at the viewing station don't go back down the way you came up. Instead, continue on the trail and you will come to more viewing spots of Prismatic. The trail will bring you back down to the main trail to the parking area. I have a lot more favored trails, but I won't mention them unless you are interested in hiking.

I've been there around September 20th when there were multiple road closures due to weather. One afternoon the only place we could get from Old Faithful was West Yellowstone so we drove there for a late lunch and a grocery run. The next day Craig Pass was closed and we had to detour past Canyon from Old Faithful to get to the Tetons. I signed up for Yellowstone road closure texts. I remember the ranger at the OF visitor center telling people about the road closures and reminding them to always carry important meds because you never knew when you wouldn't be able to get back to your lodging.

Don't forget the bear spray if you are going on trails.

Thank you all, especially Pam, for these helpful responses. I really appreciate the time you all took to respond.

Nancy