Lloyd Grass, a person committed to the custody of the Missouri Department of Mental Health, appeals the district court’s dismissal of his 28 U.S.C. § 2254 petition for failure to exhaust state remedies. Because we conclude that Grass has exhausted the claim he raises in his petition, we reverse.
I. BACKGROUND
In 1992, Grass stabbed his wife to death. The State of Missouri charged him with first-degree murder. After a mental evaluation, Grass was diagnosed with Psychotic Disorder, Not Otherwise Specified, In Partial Remission. Following this diagnosis, Grass’s plea of not guilty by reason of mental disease or defect was accepted, and he was committed to the custody of the Missouri Department of Mental Health, pursuant to Mo.Rev.Stat. section 552.040.2.1 Over the next several years, Grass unsuccessfully petitioned for release. In 1996, he escaped from St. Louis State Hospital and consequently was convicted and imprisoned for escape. After serving 28 months of his 5-year escape sentence, Grass was paroled back into the custody of the Department of Mental Health in 2001.
Under section 552.040, a committed person can petition for either conditional or unconditional release. Conditional release is for a limited duration and is qualified by reasonable conditions. See § 552.040.10(3). To obtain conditional release a petitioner must prove, by clear and convincing evidence, that he “is not likely to be dangerous to others while on conditional release.” § 552.040.12(6). “[A] conditional release implies that despite a mental disease or disorder, [the committed person is] eligible for limited freedom from a mental health facility, subject to certain conditions.” Greeno v. State, 59 S.W.3d 500, 504 (Mo. banc 2001). Unconditional release, by contrast, can be granted only if the petitioner shows “by clear and convincing evidence that [he] ... does not have, and in the reasonable future is not likely to have, a mental disease or defect rendering [him] dangerous to the safety of himself or others.” § 552.040.7. In the case of an individual, like Grass, who was committed pursuant to an acquittal of first-degree murder, neither conditional nor unconditional release may be granted unless the court also finds that the person “is not now and is not likely in the reasonable future to commit another violent crime” and “is aware of the nature of the violent crime committed ... and presently possesses the capacity to appreciate the criminality of the violent crime ... and ... to conform [his] conduct to the requirements of law in the future.” See § 552.040.20. The denial of a petition for either conditional or unconditional release is “without prejudice to the filing of another application after the expiration of one year.” § 552.040.13, 8.
In 2004, Grass filed petitions for both conditional and unconditional release. The Circuit Court of Warren County, Missouri consolidated the petitions and, after a hearing, entered judgment denying Grass’s petition for unconditional release but granting his petition for conditional release. The court found that Grass “does not suffer from any mental disease or defect,” that “[h]e is not a danger to himself or others” or “likely to be dangerous to others while on conditional release,” and that “[h]e is not now and is not likely in *582the foreseeable future to commit another violent crime ... because of his mental illness.” Grass v. State, No. 99-cv-155304, slip op. at 15 (Mo.Cir.Ct. Warren Cnty. filed Mar. 10, 2006). Both Grass and the State appealed. On appeal, Grass argued that the circuit court’s findings that he “does not suffer from any mental disease or defect” and “is not a danger to himself or others” entitled him to unconditional release both under Mo.Rev.Stat. section 552.040.7 and under the Supreme Court’s holding in Foucha v. Louisiana that “keeping [a committed person] against his will in a mental institution ... absent a determination in civil commitment proceedings of current mental illness and dangerousness” violated the Due Process Clause of the Fourteenth Amendment, 504 U.S. 71, 77-78, 112 S.Ct. 1780, 118 L.Ed.2d 437 (1992). For its appeal, the State argued, inter alia, that the circuit court’s findings in support of conditional release were not supported by the evidence.
The Missouri Court of Appeals affirmed the circuit court’s denial of Grass’s petition for unconditional release. Although it acknowledged that, as part of its conditional release analysis, the circuit court had found that Grass currently was not mentally ill or a danger to others, the court of appeals concluded that, under the Missouri statute, such a finding was insufficient to entitle a petitioner to unconditional release:
[The circuit court] did not make the finding required by sections 552.040.7(6) and 552.040.9 for unconditional release that petitioner was not likely in the reasonable future to have a mental disease or defect rendering him dangerous to the safety of himself or others. This is a different factual finding from those required for conditional release, and it is not encompassed by the findings made on conditional release.
Grass v. State, 220 S.W.3d 335, 340 (Mo. Ct.App.2007). The court did not address Grass’s Foucha due-process challenge. As to the State’s appeal, the court of appeals agreed that the circuit court’s finding that Grass “is not now and is not likely in the foreseeable future to commit another violent crime” — a finding required for the grant of conditional release — was not supported by the evidence. Although ordinarily, the court noted, it would remand for limited additional findings, “the judge who presided over the trial, heard the evidence, and observed the witnesses, is now deceased. Under these circumstances, we have no alternative but to reverse the judgment and remand for a new trial.” Id. at 344. Accordingly, the court of appeals entered judgment affirming “[t]hat part of the judgment of the trial court denying unconditional release” and reversing and remanding for a new hearing “[t]hat part of the judgment of the trial court granting conditional release.” Id. at 346. Grass filed an application for transfer to the Missouri Supreme Court, which was denied.
While the remand of his petition for conditional release was pending in Warren County Circuit Court, Grass filed a petition for a writ of habeas corpus in federal district court pursuant to 28 U.S.C. § 2254, challenging only the denial of his petition for unconditional release. Citing Foucha, Grass argued that the absence of a finding that he currently suffers from a mental disease or defect — and, in fact, the presence of a finding by the circuit court that he currently does not suffer from such a disease or defect — required his unconditional release. A magistrate judge issued a Report and Recommendation concluding that Grass had exhausted his state remedies as to his unconditional release petition but recommending that the habeas petition be denied on the merits, since “the evidence considered by the Missouri appellate *583court reflected both that Petitioner had a current mental illness and that he was dangerous without monitoring.”
After de novo review of the Report and Recommendation and Grass’s objections, the district court issued an order dismissing the habeas petition for failure to exhaust state remedies. The district court noted that the circuit court’s finding that Grass currently was not mentally ill, to which Grass had pointed in support of his petition, had been vacated by the court of appeals and remanded back to the circuit court. Because the remand of Grass’s petition for conditional release was still pending in Warren County Circuit Court, the district court held that “the instant petition depends on future state court findings regarding the present condition of [Grass’s] mental health. Therefore, there remains an undecided material factual issue, and the petition seeking unconditional release is not exhausted.” Grass v. Reitz, 699 F.Supp.2d 1092, 1100-01 (E.D.Mo. 2010) (footnote omitted). However, the district court also concluded that “reasonable jurists might find the Court’s assessment ... debatable or wrong” and granted a certificate of appealability “with regard to this Court’s finding that the instant petition is not exhausted.” Id. at 1101.
Grass filed this appeal, arguing that the district court erred in concluding that he had not exhausted his state remedies with respect to his petition for unconditional release. On January 10, 2011, after the briefs had been filed in this appeal, the Circuit Court of Warren County entered judgment denying Grass’s claim for conditional release. The circuit court found that Grass had not shown that he was “not now and is not likely in the reasonable future to commit another violent crime,” Grass v. State, No. 99-cv-155304, slip op. at 5 (Mo.Cir.Ct. Warren Cnty. filed Jan. 10, 2011), or that he was “unlikely to be dangerous to others while on conditional release,” id. at 6. The circuit court found credible the expert testimony and diagnosis of a psychologist who stated that Grass’s symptoms were in remission but “could re-emerge,” id. at 4, but the court did not include an explicit finding as to whether Grass currently suffers from a mental disease or defect.2
At oral argument before this court, both Grass and the Respondent, Warden Reitz, indicated that no appeal was taken from the circuit court’s decision, and Grass conceded that any such appeal now would be untimely. Because an appeal no longer would be possible, Warden Reitz conceded that Grass’s claim now is exhausted, in that no further relief is available to him in state court. However, in light of Grass’s failure to take a timely appeal of the circuit court’s denial of his conditional release petition, Warden Reitz contended that Grass’s federal claims have been procedurally defaulted. Grass argued that no default occurred, because he was not required to pursue his conditional release petition on remand in state court in order to exhaust a claim based on the denial of his unconditional release petition.
11. DISCUSSION
We review de novo the question whether a petitioner has failed to exhaust a claim raised in his § 2254 petition. Dixon v. Dormire, 263 F.3d 774, 777 (8th *584Cir.2001). Title 28 U.S.C. § 2254(b)(1)(A) prohibits a grant of habeas relief on behalf of a person in state custody unless that person has “exhausted the remedies available in the courts of the State.” “The exhaustion requirement of § 2254(b) ensures that the state courts have the opportunity fully to consider federal-law challenges to a state custodial judgment before the lower federal courts may entertain a collateral attack upon that judgment.” Duncan v. Walker, 533 U.S. 167, 178-79, 121 S.Ct. 2120, 150 L.Ed.2d 251 (2001). The requirement prevents a federal court from granting a habeas petition based on a constitutional violation that could be redressed adequately by pursuing an avenue of state relief “still open to the habeas applicant at the time he files his application in federal court.” Humphrey v. Cady, 405 U.S. 504, 516, 92 S.Ct. 1048, 31 L.Ed.2d 394 (1972) (citing Fay v. Noia, 372 U.S. 391, 435, 83 S.Ct. 822, 9 L.Ed.2d 837 (1963)).
If a habeas petitioner has failed to present his federal claims in state court and untimeliness or some other state procedural hurdle now prevents him from doing so, that petitioner “meets the technical requirements for exhaustion; there are no state remedies any longer ‘available’ to him.” Coleman v. Thompson, 501 U.S. 722, 732, 111 S.Ct. 2546, 115 L.Ed.2d 640 (1991). However, that petitioner’s procedural default may constitute an “independent and adequate state ground” barring federal habeas relief, see id., absent a showing of either cause and prejudice or actual innocence, see Murray v. Carrier, 477 U.S. 478, 485-96, 106 S.Ct. 2639, 91 L.Ed.2d 397 (1986). In the instant case, Warden Reitz argues that Grass was required to pursue his petition for conditional release through a complete round of state-court review before his Foucha due-process claim was exhausted properly. Since Grass failed to appeal the circuit court decision denying his conditional release petition on remand, Warden Reitz contends that Grass’s Foucha due-process claim now is procedurally defaulted. Despite the post-briefing developments in state court, then, the key question on appeal remains the one certified for our review: whether Grass was required to pursue his Foucha due-process claim in the context of the state-court remand of his conditional release petition in order to exhaust the claim properly. See O’Sullivan v. Boerckel, 526 U.S. 838, 848, 119 S.Ct. 1728, 144 L.Ed.2d 1 (1999) (“[W]e ask not only whether a prisoner has exhausted his state remedies, but also whether he has properly exhausted those remedies, i.e., whether he has fairly presented his claims to the state courts.”). We conclude that he was not required to pursue the claim further.
Title 28 U.S.C. § 2254(c) provides that a petitioner has not exhausted state remedies “if he has the right under the law of the State to raise, by any available procedure, the question presented.” “Although this language could be read to effectively foreclose habeas review by requiring a state prisoner to invoke any possible avenue of state court review, we have never interpreted the exhaustion requirement in such a restrictive fashion.” O’Sullivan, 526 U.S. at 844, 119 S.Ct. 1728. Instead, the Supreme Court has held that § 2254(c) “requires only that state prisoners give state courts a fair opportunity to act on their claims.” Id. To meet the requirement, “state prisoners must give the state courts one full opportunity to resolve any constitutional issues by invoking one complete round of the State’s established appellate review process.” Id. at 845, 119 S.Ct. 1728.
Although most of the cases defining the contours of the exhaustion re*585quirement arise from challenges to state custody following criminal conviction, the Supreme Court’s holding that exhaustion requires only a fair presentation that is satisfied “by invoking one complete round of the State’s established appellate review process,” O’Sullivan, 526 U.S. at 845, 119 S.Ct. 1728, applies with equal force when a habeas petitioner seeks to challenge state custody pursuant to a civil commitment, see Beaulieu v. Minnesota, 583 F.3d 570, 575 (8th Cir.2009). “To satisfy the exhaustion requirement, a person confined in the Missouri State Hospital must apply for release under section 552.040 before filing a petition for a writ of habeas corpus. Additionally, if the application for release is denied, the confined person must appeal to the Missouri Court of Appeals.” Kolocotronis v. Holcomb, 925 F.2d 278, 279 (8th Cir.1991) (internal citation omitted).3
In the instant case, Grass raised his Foucha due-process challenge in his petition, under section 552.040.5, for unconditional release, as well as in his appeal from the denial of that petition. Further, upon the appellate court’s affirmance of the denial of unconditional relief, Grass filed an application for transfer to the Missouri Supreme Court, even though such a step is not necessary in order to exhaust a claim for habeas review. See Taylor v. Roper, 561 F.3d 859, 861 n. 2 (8th Cir.2009). He therefore has fairly presented the claim he now asserts as a basis for federal habeas relief by invoking one complete round of Missouri’s established appellate review process. See Kolocotronis, 925 F.2d at 279.
Although his petition for conditional release remained pending in Warren County Circuit Court when Grass filed his federal habeas petition, “a petitioner should not be barred from federal relief because of the mere possibility of success in additional state proceedings.” Rodgers v. Wyrick, 621 F.2d 921, 924 (8th Cir. 1980). Nor was the district court barred from considering Grass’s Foucha due-process challenge to the denial of his petition for unconditional release merely because the state litigation over his conditional release petition was ongoing when he filed his § 2254 petition. “[T]he pendency of parallel state court proceedings does not necessarily prevent federal courts from adjudicating § 2254 petitions containing fully exhausted federal claims.” Turnage v. Fabian, 606 F.3d 933, 942 (8th Cir.2010); accord Nowaczyk v. Warden, N.H. State Prison, 299 F.3d 69, 77 (1st Cir.2002) (rejecting “the broad rule that federal courts must dismiss § 2254 petitions whenever the petitioner is in the process of adjudicating other, related claims in the state courts”); Escobedo v. Estelle, 650 F.2d 70, 74 (5th Cir.) (holding that petitioner’s challenge to his conviction was exhausted even though “essentially the same claim” was pending in state court as part of a direct appeal from a later conviction and sentence enhanced on account of the conviction he sought to challenge), modified on other grounds, 655 F.2d 613 (5th Cir.1981). Forcing Grass to pursue his Foucha due-process claim further in the context of his *586conditional release petition when he already has invoked it through one full round-of state-court review of his unconditional release petition would require him to go above and beyond the fair presentation that satisfies the exhaustion requirement.
III. CONCLUSION
We conclude that because Grass pursued his Foucha due-process challenge to the denial of unconditional release through “one complete round of the State’s established appellate review process,” O’Sullivan, 526 U.S. at 845, 119 S.Ct. 1728, he properly exhausted that claim, see Kolocotronis, 925 F.2d at 279. Accordingly, we reverse the district court’s dismissal of Grass’s § 2254 petition and remand for further proceedings.