WhenToBird

Chondestes grammacus · Passerellidae

When Do Lark Sparrows Arrive in Arizona?

Adult Lark Sparrow
Photo: Anne Parsons, CC0 1.0 via iNaturalist

Lark Sparrows are in Arizona all year, but most are here in summer: numbers build from late July, peak in early September (14% of checklists), and fall back by late September. In the quietest week (mid June) they are still on about 2.0% of checklists.

When to look

Numbers buildJul 22-31late July
PeakSep 1-7early September
Fall back bySep 22-30late September
FewestJun 15-21mid June

Best: early September. Here all year; numbers build from late July and fall back by late September. Peak: on about 14% of Arizona checklists.

  1. Januncommon
  2. Febuncommon
  3. Maruncommon
  4. Aprpeak season
  5. Maypeak season
  6. Jununcommon
  7. Julcommon
  8. Augpeak season
  9. Seppeak season
  10. Octcommon
  11. Novuncommon
  12. Decuncommon

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

0%5%10%15%Jan 1-7: 4.7% of 34758 checklistsJan 8-14: 4.7% of 29835 checklistsJan 15-21: 4.3% of 29279 checklistsJan 22-31: 4.6% of 39716 checklistsFeb 1-7: 4.4% of 27299 checklistsFeb 8-14: 4.2% of 28703 checklistsFeb 15-21: 3.7% of 35357 checklistsFeb 22-28: 4.0% of 29889 checklistsMar 1-7: 4.1% of 29932 checklistsMar 8-14: 4.4% of 32982 checklistsMar 15-21: 4.2% of 34731 checklistsMar 22-31: 4.1% of 50213 checklistsApr 1-7: 4.7% of 35788 checklistsApr 8-14: 5.7% of 38087 checklistsApr 15-21: 9.6% of 41520 checklistsApr 22-30: 14% of 55218 checklistsMay 1-7: 13% of 39688 checklistsMay 8-14: 9.4% of 39398 checklistsMay 15-21: 5.8% of 29562 checklistsMay 22-31: 3.1% of 36774 checklistsJun 1-7: 2.3% of 21313 checklistsJun 8-14: 2.0% of 19129 checklistsJun 15-21: 2.0% of 17922 checklistsJun 22-30: 2.1% of 21188 checklistsJul 1-7: 2.1% of 17325 checklistsJul 8-14: 3.0% of 16463 checklistsJul 15-21: 4.5% of 18642 checklistsJul 22-31: 7.2% of 31215 checklistsAug 1-7: 11% of 28163 checklistsAug 8-14: 12% of 31329 checklistsAug 15-21: 13% of 23878 checklistsAug 22-31: 13% of 28508 checklistsSep 1-7: 14% of 20878 checklistsSep 8-14: 14% of 19671 checklistsSep 15-21: 12% of 19859 checklistsSep 22-30: 9.1% of 25179 checklistsOct 1-7: 7.1% of 19420 checklistsOct 8-14: 6.2% of 21925 checklistsOct 15-21: 6.0% of 20995 checklistsOct 22-31: 5.6% of 29258 checklistsNov 1-7: 5.4% of 21269 checklistsNov 8-14: 5.2% of 22753 checklistsNov 15-21: 5.3% of 21982 checklistsNov 22-30: 5.1% of 29475 checklistsDec 1-7: 5.0% of 20810 checklistsDec 8-14: 5.0% of 22229 checklistsDec 15-21: 5.1% of 25148 checklistsDec 22-31: 4.6% of 39567 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 Arizona 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 Arizona

Best counties

Share of checklists at the peak
  1. Greenlee CountyBest mid August · 88 checklists that week, 2,745 in all29%
  2. Pima CountyBest the second week of September · 5775 checklists that week, 437,722 in all18%
  3. Yavapai CountyBest early May · 2499 checklists that week, 83,606 in all17%
  4. Santa Cruz CountyBest late September · 2013 checklists that week, 162,726 in all17%
  5. Cochise CountyBest early May · 8536 checklists that week, 190,093 in all17%
  6. Pinal CountyBest mid August · 548 checklists that week, 40,036 in all17%

Best spots

Share of checklists at the peak
  1. Monterey ParkMaricopa County, best early April · 23 checklists that week, 175 in all89%
  2. Catalina Regional ParkPima County, best mid August · 21 checklists that week, 868 in all88%
  3. Road Runner ParkMaricopa County, best mid October · 21 checklists that week, 134 in all85%
  4. Himmel ParkPima County, best late April · 54 checklists that week, 2,776 in all83%

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

Best time of day

In Arizona, the Lark Sparrow is most often listed on checklists started between 5 and 7 am (11% of those checklists).

0%5%10%15%12 am: too few checklists (488) to judge1 am: too few checklists (503) to judge2 am: too few checklists (489) to judge3 am: too few checklists (735) to judge4 am: too few checklists (4115) to judge5 am: 10% of 38350 checklists6 am: 12% of 118786 checklists7 am: 9.3% of 183415 checklists8 am: 7.6% of 187346 checklists9 am: 6.0% of 151342 checklists10 am: 4.9% of 124522 checklists11 am: 4.3% of 97088 checklists12 pm: 4.3% of 78110 checklists1 pm: 4.8% of 73059 checklists2 pm: 5.2% of 68912 checklists3 pm: 5.5% of 68060 checklists4 pm: 5.3% of 69387 checklists5 pm: 4.9% of 52951 checklists6 pm: 3.8% of 31061 checklists7 pm: too few checklists (16076) to judge8 pm: too few checklists (5352) to judge9 pm: too few checklists (2369) to judge10 pm: too few checklists (1100) to judge11 pm: too few checklists (604) 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
January4.7%4.7%4.3%4.6%
February4.4%4.2%3.7%4.0%
March4.1%4.4%4.2%4.1%
April4.7%5.7%9.6%14%
May13%9.4%5.8%3.1%
June2.3%2.0%2.0%2.1%
July2.1%3.0%4.5%7.2%
August11%12%13%13%
September14%14%12%9.1%
October7.1%6.2%6.0%5.6%
November5.4%5.2%5.3%5.1%
December5.0%5.0%5.1%4.6%

Neighboring states

  • New Mexico: arrives the second week of April, 14 weeks earlier than Arizona
  • Nevada: arrives mid April, 13 weeks earlier than Arizona
  • Utah: arrives mid April, 13 weeks earlier than Arizona
  • California: year-round, peaks mid April

Common questions

When do Lark Sparrows arrive in Arizona?
Lark Sparrows are in Arizona all year, but most are here in summer: numbers build from late July, peak in early September (14% of checklists), and fall back by late September. In the quietest week (mid June) they are still on about 2.0% of checklists.
When do Lark Sparrows leave Arizona?
Lark Sparrows never fully leave Arizona: numbers fall back below half their usual rate by late September, but some are still reported in every week, about 2.0% of checklists at the low.
When is the best time to see a Lark Sparrow in Arizona?
The Lark Sparrow is reported most often in early September, on about 14% of Arizona checklists.
Where in Arizona are Lark Sparrows seen most often?
By county, Greenlee County, Pima County, and Yavapai County have the highest peak reporting rates for the Lark Sparrow (counties with at least 200 checklists).