One box for all of it: the 63 national parks, hundreds of national seashores, monuments, and historic sites, over 100 national forests, and all 50 state park systems.
ACADDog-friendly
NPSABanned on trails
ARCHBanned on trails
BADLBanned on trails
BIBEBanned on trails
BISCBanned on trails
BLCALimited access
BRCALimited access
CANYBanned on trails
CARELimited access
CAVEBanned on trails
CHISNo pets allowed
CONGDog-friendly
CRLALimited access
CUVADog-friendly
DEVABanned on trails
DENALimited access
DRTOLimited access
EVERBanned on trails
GAARDog-friendly
JEFFDog-friendly
GLACBanned on trails
GLBABanned on trails
GRCALimited access
GRTEBanned on trails
GRBALimited access
GRSADog-friendly
GRSMLimited access
GUMOLimited access
HALEBanned on trails
HAVOBanned on trails
HOSPDog-friendly
INDUDog-friendly
ISRONo pets allowed
JOTRBanned on trails
KATMLimited access
KEFJBanned on trails
SEKIBanned on trails
KOVADog-friendly
LACLDog-friendly
LAVOBanned on trails
MACADog-friendly
MEVELimited access
MORABanned on trails
NERIDog-friendly
NOCALimited access
OLYMLimited access
PEFODog-friendly
PINNBanned on trails
REDWLimited access
ROMOBanned on trails
SAGULimited access
SEKIBanned on trails
SHENDog-friendly
THROBanned on trails
VIISDog-friendly
VOYALimited access
WHSADog-friendly
WICALimited access
WRSTDog-friendly
YELLBanned on trails
YOSELimited access
ZIONLimited access
ABLIDog-friendly
ADAMDog-friendly
AGFODog-friendly
ALKALimited access
ALCANo pets allowed
ALPODog-friendly
AMMEDog-friendly
AMISDog-friendly
ANACDog-friendly
ANDEDog-friendly
ANJOLimited access
ANTIDog-friendly
APISDog-friendly
APPADog-friendly
APCODog-friendly
ARPODog-friendly
ARHONo pets allowed
ASISLimited access
AZRULimited access
BANDBanned on trails
BEOLDog-friendly
BICYBanned on trails
BIHOBanned on trails
BISODog-friendly
BITHDog-friendly
BICADog-friendly
BLRVDog-friendly
BLRIDog-friendly
BLUEDog-friendly
BOWADog-friendly
BRCRDog-friendly
BRVBNo pets allowed
BUFFLimited access
CABRLimited access
CANEDog-friendly
CANALimited access
CARIDog-friendly
CACHLimited access
CACOLimited access
CAHADog-friendly
CALODog-friendly
CAHIDog-friendly
CAVOLimited access
CARLDog-friendly
CAGRDog-friendly
CASALimited access
CACLNo pets allowed
CAMONo pets allowed
CATODog-friendly
CEBRLimited access
CEBEDog-friendly
CHCUDog-friendly
CHAMDog-friendly
CHPIDog-friendly
CHYODog-friendly
CHATDog-friendly
CHOHDog-friendly
CHCHDog-friendly
CHICDog-friendly
CHIRLimited access
CIRODog-friendly
COLMBanned on trails
COROLimited access
COWPDog-friendly
CRMOBanned on trails
CUGADog-friendly
CUISLimited access
CUREDog-friendly
CECHLimited access
DAAVDog-friendly
DESODog-friendly
DEWADog-friendly
DEPODog-friendly
DETOBanned on trails
DINOLimited access
DDEMLimited access
EBLADog-friendly
EDALNo pets allowed
EFMODog-friendly
EISEDog-friendly
ELMADog-friendly
ELMODog-friendly
ELRODog-friendly
ELISNo pets allowed
EUONDog-friendly
FEHANo pets allowed
FIISLimited access
FILABanned on trails
FLNILimited access
FLFOBanned on trails
FOBODog-friendly
FODADog-friendly
FODODog-friendly
FODUDog-friendly
FOFODog-friendly
FOFRDog-friendly
FOLADog-friendly
FOLSDog-friendly
FOMADog-friendly
FOMCDog-friendly
FOMRDog-friendly
FONEDog-friendly
FOPODog-friendly
FOPUDog-friendly
FORADog-friendly
FOSCDog-friendly
FOSMDog-friendly
FOSTDog-friendly
FOSULimited access
FOUNDog-friendly
FOUSDog-friendly
FOVADog-friendly
FOWADog-friendly
FOBUDog-friendly
FRSPDog-friendly
FRRILimited access
FRHIDog-friendly
GATELimited access
GEROLimited access
GEWADog-friendly
GWCADog-friendly
GWMPDog-friendly
GETTDog-friendly
GICLLimited access
GLCADog-friendly
GOGADog-friendly
GOSPDog-friendly
GOISNo pets allowed
GRPODog-friendly
GRKODog-friendly
GRFADog-friendly
GREEDog-friendly
GUCODog-friendly
GUISLimited access
HAFOBanned on trails
HAGRDog-friendly
HAMPDog-friendly
HAFEDog-friendly
HARTDog-friendly
HEHODog-friendly
JAMEDog-friendly
HOFRDog-friendly
HOMEBanned on trails
HOCUDog-friendly
HOFUDog-friendly
HOBEDog-friendly
HOVEDog-friendly
INDEDog-friendly
JAGADog-friendly
JELABanned on trails
JECABanned on trails
JICADog-friendly
JODADog-friendly
JOFILimited access
JOMUDog-friendly
JOFLDog-friendly
KAHODog-friendly
KAWWDog-friendly
KEAQDog-friendly
KEMODog-friendly
KEWEDog-friendly
KIMODog-friendly
KLGOLimited access
KNRIDog-friendly
LAKEDog-friendly
LARODog-friendly
LABEBanned on trails
LEWIDog-friendly
LIBODog-friendly
LIHODog-friendly
LIBIBanned on trails
LIRIDog-friendly
CHSCDog-friendly
LONGDog-friendly
LOWEDog-friendly
LYJOLimited access
MAWADog-friendly
MAPRLimited access
MANZDog-friendly
MABIDog-friendly
MLKMDog-friendly
MALUDog-friendly
MAVADog-friendly
MAMCNo pets allowed
MISPDog-friendly
MIINBanned on trails
MIMADog-friendly
MIMIDog-friendly
MISSLimited access
MNRRDog-friendly
MOJADog-friendly
MONODog-friendly
MOCADog-friendly
MORRDog-friendly
MORULimited access
MUWONo pets allowed
NATCDog-friendly
NATTDog-friendly
NATRDog-friendly
NACEDog-friendly
NAMADog-friendly
NABRBanned on trails
NAVALimited access
NEBEDog-friendly
NEPHDog-friendly
NEPEDog-friendly
NICODog-friendly
NISIDog-friendly
NIOBLimited access
NOCODog-friendly
OBEDDog-friendly
OCMUDog-friendly
OKCINo pets allowed
ORCABanned on trails
ORPILimited access
OXHIDog-friendly
PAISDog-friendly
PAGRDog-friendly
PERIDog-friendly
VALRLimited access
PECODog-friendly
PEVIDog-friendly
PETEDog-friendly
PETRDog-friendly
PIROLimited access
PISPBanned on trails
PIPEDog-friendly
PISCDog-friendly
PORELimited access
POCHNo pets allowed
PRWIDog-friendly
PULLDog-friendly
PUHOLimited access
RABRNo pets allowed
REERDog-friendly
RICHDog-friendly
RIGRBanned on trails
RIRADog-friendly
ROCRDog-friendly
ROCADog-friendly
RORIDog-friendly
RUCADog-friendly
SAHIDog-friendly
SACRDog-friendly
SACNDog-friendly
SAPANo pets allowed
SAGADog-friendly
SAMADog-friendly
SAPUDog-friendly
SAANDog-friendly
SAFRDog-friendly
SAJHDog-friendly
SAJULimited access
SANDDog-friendly
SAFEDog-friendly
SAMODog-friendly
SARADog-friendly
SAIRDog-friendly
SCBLDog-friendly
SEMODog-friendly
SITKDog-friendly
SLBEDog-friendly
STGEDog-friendly
STEABanned on trails
STRIDog-friendly
SUCRLimited access
TAPRLimited access
THKOLimited access
WHHODog-friendly
THRBLimited access
THRILimited access
THISDog-friendly
EDISLimited access
THJELimited access
THSTDog-friendly
TIMUDog-friendly
TONTLimited access
TOSYLimited access
TULEDog-friendly
TUSKDog-friendly
TUMALimited access
TUPEDog-friendly
TUAIDog-friendly
TUINDog-friendly
TUZIDog-friendly
ULSGDog-friendly
UPDEDog-friendly
VALLLimited access
VAFODog-friendly
VAMADog-friendly
VICKDog-friendly
VIVELimited access
WACODog-friendly
WACALimited access
WABALimited access
WEFADog-friendly
WHISDog-friendly
WHMIDog-friendly
WIHODog-friendly
WICRDog-friendly
WORIDog-friendly
WRBRDog-friendly
WUPABanned on trails
YORKDog-friendly
YUCHDog-friendly