WhenToBird

Larus californicus · Laridae

When Do California Gulls Arrive in Utah?

Adult California Gull
Photo: Madeleine Claire, CC BY 4.0 via iNaturalist

The California Gull is in Utah all year. It turns up on about 15% of checklists at its peak (the second week of April) and on 7.6% in its quietest week (the second week of February).

When to look

PresentAll year
Peak weekApr 8-14the second week of April
Quietest weekFeb 8-14the second week of February

Best: the second week of April. Here all year. Peak: on about 15% of Utah checklists.

  1. Jancommon
  2. Febcommon
  3. Marpeak season
  4. Aprpeak season
  5. Maypeak season
  6. Juncommon
  7. Julcommon
  8. Augcommon
  9. Sepcommon
  10. Octcommon
  11. Novpeak season
  12. Deccommon

Darker months: more checklists report it. Outlined: peak month.

0%5%10%15%20%Jan 1-7: 8.3% of 10857 checklistsJan 8-14: 8.5% of 8333 checklistsJan 15-21: 7.7% of 8360 checklistsJan 22-31: 8.5% of 10516 checklistsFeb 1-7: 8.4% of 7416 checklistsFeb 8-14: 7.4% of 8082 checklistsFeb 15-21: 7.2% of 9643 checklistsFeb 22-28: 8.7% of 7960 checklistsMar 1-7: 11% of 7998 checklistsMar 8-14: 11% of 8581 checklistsMar 15-21: 12% of 8637 checklistsMar 22-31: 14% of 13006 checklistsApr 1-7: 15% of 10562 checklistsApr 8-14: 15% of 11694 checklistsApr 15-21: 14% of 11382 checklistsApr 22-30: 12% of 16626 checklistsMay 1-7: 11% of 13523 checklistsMay 8-14: 11% of 14714 checklistsMay 15-21: 13% of 13711 checklistsMay 22-31: 11% of 16546 checklistsJun 1-7: 10% of 10284 checklistsJun 8-14: 11% of 9530 checklistsJun 15-21: 10% of 8854 checklistsJun 22-30: 9.5% of 10566 checklistsJul 1-7: 9.2% of 7987 checklistsJul 8-14: 8.7% of 7471 checklistsJul 15-21: 10% of 7240 checklistsJul 22-31: 11% of 9329 checklistsAug 1-7: 11% of 6521 checklistsAug 8-14: 11% of 6423 checklistsAug 15-21: 9.1% of 6208 checklistsAug 22-31: 9.8% of 9089 checklistsSep 1-7: 11% of 7081 checklistsSep 8-14: 10% of 7306 checklistsSep 15-21: 9.3% of 7208 checklistsSep 22-30: 9.2% of 8876 checklistsOct 1-7: 9.7% of 7265 checklistsOct 8-14: 9.5% of 7226 checklistsOct 15-21: 9.5% of 7007 checklistsOct 22-31: 11% of 8443 checklistsNov 1-7: 12% of 6711 checklistsNov 8-14: 12% of 6290 checklistsNov 15-21: 13% of 6169 checklistsNov 22-30: 12% of 8228 checklistsDec 1-7: 10% of 6011 checklistsDec 8-14: 9.1% of 6044 checklistsDec 15-21: 7.9% of 6721 checklistsDec 22-31: 7.5% of 9982 checklistsJanFebMarAprMayJunJulAugSepOctNovDec
Share of complete checklists reporting it, by week (4 per month). Grey bars: fewer than 10 checklists, not counted.

Frequency is the share of complete checklists in Utah that listed the bird, 2016–2025. It is not a head count, and it follows where and when people go birding. How to read it.

JanFebMarAprMayJunJulAugSepOctNovDec
today
Second week of November

Each county is shaded by the share of complete checklists there that listed the bird, blended with the weeks either side. Darker is more often. It follows where people watch birds, not how many birds there are. How to read it.

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Where in Utah

Best counties

Share of checklists at the peak
  1. Summit CountyBest early November · 214 checklists that week, 13,829 in all34%
  2. Piute CountyBest the second week of September · 21 checklists that week, 1,035 in all31%
  3. Davis CountyBest mid June · 681 checklists that week, 39,952 in all29%
  4. Rich CountyBest the second week of September · 20 checklists that week, 1,563 in all29%
  5. Wasatch CountyBest early November · 80 checklists that week, 7,780 in all28%
  6. Box Elder CountyBest the second week of August · 207 checklists that week, 9,867 in all27%

Best spots

Share of checklists at the peak
  1. Decker Lake ParkSalt Lake County, best the second week of April · 97 checklists that week, 1,965 in all96%
  2. Lee Kay State Wildlife CenterSalt Lake County, best the second week of June · 29 checklists that week, 3,804 in all92%
  3. Silver Sands BeachSalt Lake County, best mid July · 21 checklists that week, 894 in all90%
  4. Hyrum State ParkCache County, best the second week of May · 21 checklists that week, 791 in all89%

Busy spots report more of everything; compare the checklist counts before you drive anywhere.

Best time of day

In Utah, the California Gull is most often listed on checklists started between 6 and 8 am (12% of those checklists).

0%5%10%15%12 am: too few checklists (242) to judge1 am: too few checklists (178) to judge2 am: too few checklists (169) to judge3 am: too few checklists (162) to judge4 am: too few checklists (284) to judge5 am: too few checklists (1984) to judge6 am: 14% of 11714 checklists7 am: 12% of 33209 checklists8 am: 9.9% of 46944 checklists9 am: 9.6% of 46290 checklists10 am: 10% of 43144 checklists11 am: 11% of 36893 checklists12 pm: 11% of 32758 checklists1 pm: 11% of 30142 checklists2 pm: 11% of 29414 checklists3 pm: 11% of 29491 checklists4 pm: 11% of 29154 checklists5 pm: 11% of 22256 checklists6 pm: 11% of 17383 checklists7 pm: 9.3% of 13099 checklists8 pm: too few checklists (6647) to judge9 pm: too few checklists (1753) to judge10 pm: too few checklists (599) to judge11 pm: too few checklists (307) to judge12a3a6a9a12p3p6p9p
Share of checklists started in each local hour that reported it. It reflects when people go birding as well as when birds are active. Grey hours have too few checklists (under 2% of the state’s, or under 200) to judge.
Week-by-week table
MonthDays 1-78-1415-2122-end
January8.3%8.5%7.7%8.5%
February8.4%7.4%7.2%8.7%
March11%11%12%14%
April15%15%14%12%
May11%11%13%11%
June10%11%10%9.5%
July9.2%8.7%10%11%
August11%11%9.1%9.8%
September11%10%9.3%9.2%
October9.7%9.5%9.5%11%
November12%12%13%12%
December10%9.1%7.9%7.5%

Neighboring states

  • Wyoming: summer visitor, peaks mid April
  • Nevada: all year, most in winter, peaks the second week of January
  • Colorado: winter visitor, peaks early November
  • Idaho: year-round, peaks early November

Common questions

When do California Gulls arrive in Utah?
The California Gull is in Utah all year. It turns up on about 15% of checklists at its peak (the second week of April) and on 7.6% in its quietest week (the second week of February).
When do California Gulls leave Utah?
The California Gull does not leave Utah: it is reported all year, from 7.6% of checklists in the second week of February to 15% in the second week of April.
When is the best time to see a California Gull in Utah?
The California Gull is reported most often in the second week of April, on about 15% of Utah checklists.
Where in Utah are California Gulls seen most often?
By county, Summit County, Piute County, and Davis County have the highest peak reporting rates for the California Gull (counties with at least 200 checklists).