USA Time Zone Anomalies, Part I

On January 13, 2009 · 6 Comments

Matthew of the prullmw blog[1] is a regular reader and commentator on the Twelve Mile Circle. Recently he wondered whether I might have an interest in time zone boundaries. Indeed I do!

I mentioned the whole Arizona, Navajo, Hopi complexity in my response, but I’d been unable to find a decent map to get the point across. Mapquest provides time zone boundaries at its higher-level views but those disappear just as I click-down to the proper level of detail. The other online mapping sites provide no help either, and the static maps are entirely hit-or-miss. It shouldn’t be this difficult to find a good time zone map but apparently that’s the case unless one wants coverage of the entire United States.

Finally I found a map that demonstrates my point. Actually, more specifically, I made a map. I went to the National Atlas of the United States, applied a time zone layer and dropped the resulting image into graphics software to affix the proper labels. Thanks goodness for taxpayer supported public-domain images. Here’s the result, as edited:


Time Zones in Northeastern Arizona


The boundaries of the Hopi Nation are enclosed entirely within the boundaries of the Navajo Nation. The Navajo Nation has an exclave, Jeddito, within the primary Hopi territory. Likewise the Hopi Nation also has an exclave, Moenkopi, within the Navajo Nation. A major Navajo town with more than 8,000 inhabitants, Tuba City, sits just above Moenkopi north of the intersection of Routes 160 and 264. The Navajo Nation recognizes daylight saving time (DST). Arizona and the Hopi Nation do not. All is fine during the winter months when everyone observes Mountain Standard Time but it spirals into confusion when DST kicks-in.

Imagine someone traveling from Jeddito on Route 264 to Tuba City during the summer. This is not far-fetched. Undoubtedly this happens all the time. Our fictional traveler would start in DST (Jeddito, Navajo exclave), switch to standard time (Hopi), switch to DST (Navajo), switch to standard time (Moenkopi, Hopi exclave) and switch to DST (Navajo) at Tuba City. In reality our traveler wouldn’t actually change his watch four times along this 90 mile route but it’s still a fun set of circumstances to ponder. Plus the lines aren’t even as clean as suggested. For instance, many businesses in Tuba City observe standard time just like the rest of Arizona for commercial reasons and to avoid confusing tourists.

You can find more information about Arizona time zones on a couple of other places on my website if you’re interested:

Matthew brought another fun time zone anomaly to my attention and it’s definitely worth discussing. He suggested I check out the land just south of Grangeville, Idaho. This one is awesome!


Idaho's Time Zone Anomaly


Much of northern Idaho follows Pacific Time which makes sense from an affinity perspective. Residents of Coeur d’Alene are located over four hundred miles away from Boise, the state capital. However they’re only thirty miles away from Spokane, Washington. It’s natural that they would want to align with Pacific Time like their nearby neighbors and cohorts in Washington rather than the Mountain Time observed downstate, and indeed that’s the case.

The time zone boundary crossing Idaho doesn’t follow a straight path. Exact lines don’t make much sense in a rugged, wilderness area. Rather, the boundary snakes along natural features, primarily the Salmon River, as it courses between Oregon and Montana. Either you’re standing on one side of the river or the other. You know what time to expect. Easy.

Rivers, being what they are, follow underlying terrain in search of an outlet. This creates a little hernia of Mountain Time protruding into Pacific Time along the western edge of Idaho. Right here it’s possible to travel due east and move into a later time zone. Generally one has to turn the clock forward when crossing a time zone boundary heading east, but not here. For within this anomaly, this little knob created by the Salmon River, the exact opposite holds true. One turns the clock back.



View Larger Map

The Time Zone Bridge sits a couple of miles outside of Riggins, Idaho, a town found within the anomaly. Cross the little bridge heading northeast, and pay attention to the sign. You’ve transitioned into Pacific Time!

Thanks, Matthew, for that amazing fact. Also check out Part II for even more time zone anomalies in the United States.

[1]Currently in hibernation but I look forward to when he starts reporting on his Goals for 2009, some of which involve geography quests!

On January 13, 2009 · 6 Comments

6 Responses to “USA Time Zone Anomalies, Part I”

  1. […] outlined a couple of odd time zone anomalies within the United States in Part I, and here I continue the effort with several more examples. While none of these are quite as […]

  2. Jason Pantano says:

    I am so happy I found your site, I am a geography major but I currently work in a call center. There is map of the u.s. with all of the time zone boundaries in my cubicle and I am constantly looking for those timezone anomalies that u talk about, I was always especially intrigued by the ID one, very cool write up, thank you

    • Thanks, Jason. It’s always nice to meet another aficionado of geo-anomalies. Weird time zones are a recurring theme on the Twelve Mile Circle so I hope you check back again soon.

  3. Jeff Rundell says:

    I was driving down into Arizona from 4 Corners with a NPS brochure that said the last tour of the day at Navaho National Monument started at 4PM. I remembered something about Arizona not having daylight saving, so I found a Flagstaff radio station which told me it was 3:30. I turned off the highway with 15 minutes to go and pulled into the parking lot as the 4 o’clock news came on. I ran inside to be told that I had missed it by an hour. That’s when I learned that while Arizona opts out the Navajo Nation does not. The monument, embedded in the reservation, follows the Navajo. Oh well.

  4. Mark Cannon says:

    So, if America/Boise is on Mountain Time and changes to DST at the same time as America/Denver, why is there an America/Boise at all?

    • January First-of-May says:

      In such cases, the answer is usually “because it used to be different a few decades ago”.

      As far as I could figure out from Wikipedia, in this particular case, there were some minor complications in 1974 that made it change to DST a bit later than Denver. The tz database goes back a long way.

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