WhenToBird

Passer domesticus · Passeridae

When Do House Sparrows Arrive in Maryland?

Adult male House Sparrow
Photo: Esteban Poveda, CC BY 4.0 via iNaturalist

The House Sparrow is in Maryland all year. It turns up on about 31% of checklists at its peak (the second week of July) and on 18% in its quietest week (the second week of September).

When to look

PresentAll year
Peak weekJul 8-14the second week of July
Quietest weekSep 8-14the second week of September

Best: the second week of July. Here all year. Peak: on about 31% of Maryland checklists.

  1. Jancommon
  2. Febpeak season
  3. Marpeak season
  4. Aprpeak season
  5. Maypeak season
  6. Junpeak season
  7. Julpeak season
  8. Augpeak season
  9. Sepcommon
  10. Octpeak season
  11. Novpeak season
  12. Deccommon

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

0%10%20%30%40%Jan 1-7: 22% of 28716 checklistsJan 8-14: 22% of 21449 checklistsJan 15-21: 22% of 21267 checklistsJan 22-31: 23% of 29144 checklistsFeb 1-7: 23% of 21347 checklistsFeb 8-14: 27% of 22166 checklistsFeb 15-21: 27% of 29986 checklistsFeb 22-28: 25% of 22427 checklistsMar 1-7: 24% of 21389 checklistsMar 8-14: 25% of 22192 checklistsMar 15-21: 26% of 22823 checklistsMar 22-31: 27% of 33720 checklistsApr 1-7: 28% of 25513 checklistsApr 8-14: 28% of 27718 checklistsApr 15-21: 29% of 29328 checklistsApr 22-30: 30% of 42595 checklistsMay 1-7: 31% of 38532 checklistsMay 8-14: 31% of 42722 checklistsMay 15-21: 30% of 31936 checklistsMay 22-31: 29% of 36903 checklistsJun 1-7: 30% of 23191 checklistsJun 8-14: 29% of 21853 checklistsJun 15-21: 30% of 21000 checklistsJun 22-30: 30% of 25133 checklistsJul 1-7: 31% of 18715 checklistsJul 8-14: 32% of 16376 checklistsJul 15-21: 31% of 15793 checklistsJul 22-31: 30% of 21969 checklistsAug 1-7: 28% of 16013 checklistsAug 8-14: 25% of 15249 checklistsAug 15-21: 24% of 15674 checklistsAug 22-31: 20% of 24925 checklistsSep 1-7: 19% of 19808 checklistsSep 8-14: 18% of 18513 checklistsSep 15-21: 18% of 21901 checklistsSep 22-30: 21% of 22901 checklistsOct 1-7: 22% of 19111 checklistsOct 8-14: 23% of 18482 checklistsOct 15-21: 24% of 17380 checklistsOct 22-31: 25% of 23992 checklistsNov 1-7: 25% of 17915 checklistsNov 8-14: 23% of 18905 checklistsNov 15-21: 23% of 16259 checklistsNov 22-30: 23% of 22852 checklistsDec 1-7: 24% of 16108 checklistsDec 8-14: 23% of 16512 checklistsDec 15-21: 22% of 18952 checklistsDec 22-31: 21% of 29728 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 Maryland 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 Maryland

Best counties

Share of checklists at the peak
  1. Baltimore CountyBest the second week of May · 5509 checklists that week, 136,139 in all49%
  2. Montgomery CountyBest late June · 4209 checklists that week, 219,548 in all46%
  3. Prince George's CountyBest the second week of May · 3136 checklists that week, 87,907 in all41%
  4. Calvert CountyBest mid July · 739 checklists that week, 43,807 in all38%
  5. Harford CountyBest mid July · 435 checklists that week, 39,311 in all37%
  6. Allegany CountyBest late April · 607 checklists that week, 18,322 in all34%

Best spots

Share of checklists at the peak
  1. ParksideMontgomery County, best late June · 22 checklists that week, 862 in all100%
  2. Stone LakeMontgomery County, best early July · 22 checklists that week, 1,009 in all99%
  3. KilmarockMontgomery County, best late April · 23 checklists that week, 164 in all98%
  4. Layhill VillageMontgomery County, best late June · 29 checklists that week, 1,211 in all97%
  5. Chesapeake Beach Railway TrailCalvert County, best late October · 22 checklists that week, 986 in all95%

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

Best time of day

In Maryland, the House Sparrow is most often listed on checklists started between 6 and 8 am (34% of those checklists).

0%10%20%30%40%12 am: too few checklists (486) to judge1 am: too few checklists (451) to judge2 am: too few checklists (447) to judge3 am: too few checklists (766) to judge4 am: too few checklists (2076) to judge5 am: too few checklists (11098) to judge6 am: 33% of 56604 checklists7 am: 35% of 139255 checklists8 am: 32% of 148626 checklists9 am: 26% of 126820 checklists10 am: 23% of 106973 checklists11 am: 22% of 87483 checklists12 pm: 23% of 74808 checklists1 pm: 22% of 69428 checklists2 pm: 21% of 67800 checklists3 pm: 21% of 67688 checklists4 pm: 22% of 60927 checklists5 pm: 23% of 43876 checklists6 pm: 24% of 32930 checklists7 pm: too few checklists (19051) to judge8 pm: too few checklists (5708) to judge9 pm: too few checklists (1977) to judge10 pm: too few checklists (1170) to judge11 pm: too few checklists (635) 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
January22%22%22%23%
February23%27%27%25%
March24%25%26%27%
April28%28%29%30%
May31%31%30%29%
June30%29%30%30%
July31%32%31%30%
August28%25%24%20%
September19%18%18%21%
October22%23%24%25%
November25%23%23%23%
December24%23%22%21%

Neighboring states

Common questions

When do House Sparrows arrive in Maryland?
The House Sparrow is in Maryland all year. It turns up on about 31% of checklists at its peak (the second week of July) and on 18% in its quietest week (the second week of September).
When do House Sparrows leave Maryland?
The House Sparrow does not leave Maryland: it is reported all year, from 18% of checklists in the second week of September to 31% in the second week of July.
When is the best time to see a House Sparrow in Maryland?
The House Sparrow is reported most often in the second week of July, on about 31% of Maryland checklists.
Where in Maryland are House Sparrows seen most often?
By county, Baltimore County, Montgomery County, and Prince George's County have the highest peak reporting rates for the House Sparrow (counties with at least 200 checklists).