When to plant Brussels sprouts in Arizona

In spring, from Jan 1 – 30 in Apache Junction to May 10 – June 10 in Flagstaff.

In fall, from June 1 – 30 in Flagstaff to Sept 1 – Dec 31 in Yuma.

Dates are for setting out plants. USDA's earliest safe spring and latest safe fall planting dates, matched to each place's average frost dates.

Brussels sprouts planting dates by place in Arizona
PlaceSpringFall
Apache JunctionJan 1 – 30Aug 1 – Nov 1Now
Avondale—Sept 1 – Dec 31Now
Buckeye—Sept 1 – Dec 31Now
Bullhead City—Sept 1 – Dec 31Now
Camp VerdeMar 25 – Apr 20July 1 – Aug 15
Casa GrandeJan 1 – 30Aug 1 – Nov 1Now
ChandlerJan 1 – 30Aug 1 – Oct 1
Chino ValleyApr 1 – May 1July 1 – Aug 1
CoolidgeJan 15 – Feb 15Aug 1 – Oct 1
CottonwoodMar 1 – 20Aug 1 – Sept 1
DouglasFeb 15 – Mar 15Aug 1 – Sept 1
El MirageJan 1 – 30Aug 1 – Nov 1Now
EloyFeb 1 – Mar 1Aug 1 – Oct 1
FlagstaffMay 10 – June 10June 1 – 30
FlorenceJan 1 – 30Aug 1 – Nov 1Now
Fountain Hills—Sept 1 – Dec 31Now
GilbertJan 1 – 30Aug 1 – Nov 1Now
GlendaleJan 1 – 30Aug 1 – Nov 1Now
Goodyear—Sept 1 – Dec 31Now
KingmanMar 1 – 20Aug 1 – Sept 1
Lake Havasu City—Sept 1 – Dec 31Now
MaranaMar 1 – 20Aug 1 – Sept 1
MaricopaJan 15 – Feb 15Aug 1 – Sept 15
MesaJan 1 – 30Aug 1 – Nov 1Now
NogalesFeb 15 – Mar 15Aug 1 – Sept 15
Oro ValleyMar 1 – 20Aug 1 – Sept 1
Paradise Valley—Sept 1 – Dec 31Now
PaysonApr 1 – May 1July 1 – Aug 1
PeoriaJan 1 – 30Aug 1 – Nov 1Now
Phoenix—Sept 1 – Dec 31Now
PrescottApr 1 – May 1July 1 – Aug 1
Prescott ValleyApr 1 – May 1July 1 – Aug 1
Queen CreekJan 1 – 30Aug 1 – Nov 1Now
SaffordFeb 15 – Mar 15Aug 1 – Sept 1
SahuaritaFeb 1 – Mar 1Aug 1 – Oct 1
San Luis—Sept 1 – Dec 31Now
ScottsdaleJan 1 – 30Sept 1 – Dec 31Now
Show LowApr 1 – May 1June 15 – July 15
Sierra VistaMar 15 – Apr 15Aug 1 – Sept 1
Somerton—Sept 1 – Dec 31Now
SurpriseJan 1 – 30Aug 1 – Nov 1Now
TempeJan 1 – 30Aug 1 – Oct 1
TucsonJan 1 – 30Aug 1 – Nov 1Now
Yuma—Sept 1 – Dec 31Now

Planting dates: USDA Home and Garden Bulletin No. 9 (1967), tables 4 and 5. Frost dates: NOAA U.S. Climate Normals 1991–2020. “—” means the place's frost date is outside the table. The full USDA table for brussels sprouts.