FrostCal

When to Plant Cosmos in Nevada

In a typical Nevada location, start seeds indoors Feb 16 – Feb 23, then sow outdoors Mar 23 – Apr 6, then transplant outdoors Mar 23 – Mar 30. Across the state, the outdoor planting window starts as early as Jan 27 in Henderson and as late as Jun 13 in Spring Creek.

Method Direct sow
Days to maturity 60–90 days

Easy from direct seed 1-3 weeks after last frost; can also start indoors 3-4 weeks early.

Cosmos Planting Dates by City

CityStart indoorsDirect sowTransplant
Las VegasDec 27 – Jan 3Jan 31 – Feb 14Jan 31 – Feb 7
HendersonDec 23 – Dec 30Jan 27 – Feb 10Jan 27 – Feb 3
RenoMar 31 – Apr 7May 5 – May 19May 5 – May 12
North Las VegasJan 4 – Jan 11Feb 8 – Feb 22Feb 8 – Feb 15
ParadiseDec 23 – Dec 30Jan 27 – Feb 10Jan 27 – Feb 3
Sunrise ManorJan 4 – Jan 11Feb 8 – Feb 22Feb 8 – Feb 15
Spring ValleyDec 23 – Dec 30Jan 27 – Feb 10Jan 27 – Feb 3
EnterpriseJan 7 – Jan 14Feb 11 – Feb 25Feb 11 – Feb 18
SparksApr 3 – Apr 10May 8 – May 22May 8 – May 15
Carson CityApr 6 – Apr 13May 11 – May 25May 11 – May 18
WhitneyDec 23 – Dec 30Jan 27 – Feb 10Jan 27 – Feb 3
PahrumpMar 1 – Mar 8Apr 5 – Apr 19Apr 5 – Apr 12
WinchesterDec 23 – Dec 30Jan 27 – Feb 10Jan 27 – Feb 3
Summerlin SouthFeb 13 – Feb 20Mar 20 – Apr 3Mar 20 – Mar 27
ElkoMay 1 – May 8Jun 5 – Jun 19Jun 5 – Jun 12
FernleyApr 11 – Apr 18May 16 – May 30May 16 – May 23
Sun ValleyMar 31 – Apr 7May 5 – May 19May 5 – May 12
MesquiteFeb 16 – Feb 23Mar 23 – Apr 6Mar 23 – Mar 30
Boulder CityDec 24 – Dec 31Jan 28 – Feb 11Jan 28 – Feb 4
Spanish SpringsApr 5 – Apr 12May 10 – May 24May 10 – May 17
Spring CreekMay 9 – May 16Jun 13 – Jun 27Jun 13 – Jun 20
Gardnerville RanchosMay 2 – May 9Jun 6 – Jun 20Jun 6 – Jun 13

Showing the 22 most populous of 22 Nevada cities. Dates are estimates from each city's NOAA frost normals and university extension timing guidelines. See all Nevada cities.

Frequently Asked Questions

When should I plant cosmos in Nevada?

In a typical Nevada location, start seeds indoors Feb 16 – Feb 23, then sow outdoors Mar 23 – Apr 6, then transplant outdoors Mar 23 – Mar 30. Across the state, the outdoor planting window starts as early as Jan 27 in Henderson and as late as Jun 13 in Spring Creek.

When is the last frost in Nevada?

The average last spring frost in Nevada ranges from January 20 in Henderson to June 6 in Spring Creek, based on NOAA 1991–2020 climate normals.

How long do cosmos take to grow?

Cosmos typically take 60–90 days from planting to harvest. Easy from direct seed 1-3 weeks after last frost; can also start indoors 3-4 weeks early.

Other Crops in Nevada

When to plant cosmos in other states

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