diff --git a/src/test/fuzz/p2p_handshake.cpp b/src/test/fuzz/p2p_handshake.cpp
index a71a61b85c9..9b657d68360 100644
--- a/src/test/fuzz/p2p_handshake.cpp
+++ b/src/test/fuzz/p2p_handshake.cpp
@@ -41,7 +41,7 @@ FUZZ_TARGET(p2p_handshake, .init = ::initialize)
     auto& node{g_setup->m_node};
     auto& connman{static_cast<ConnmanTestMsg&>(*node.connman)};
     auto& chainman{static_cast<TestChainstateManager&>(*node.chainman)};
-    FakeNodeClock clock{1610000000s}; // any time to successfully reset ibd
+    FakeNodeClock clock{1610000000s}; // 2021-01-07, arbitrary
     FakeSteadyClock steady_clock;
     chainman.ResetIbd();
 
@@ -72,6 +72,10 @@ FUZZ_TARGET(p2p_handshake, .init = ::initialize)
             static_cast<ServiceFlags>(fuzzed_data_provider.ConsumeIntegral<uint64_t>()));
     }
 
+    // Toggle IBD from within the loop, so that some messages may be processed
+    // under IBD and the rest after leaving it. JumpOutOfIbd() latches, so guard
+    // it to call at most once.
+    bool jump_out_of_ibd{false};
     LIMITED_WHILE (fuzzed_data_provider.ConsumeBool(), 100) {
         CNode& connection = *PickValue(fuzzed_data_provider, peers);
         if (connection.fDisconnect || connection.fSuccessfullyConnected) {
@@ -80,6 +84,9 @@ FUZZ_TARGET(p2p_handshake, .init = ::initialize)
             continue;
         }
 
+        if (!jump_out_of_ibd) jump_out_of_ibd = fuzzed_data_provider.ConsumeBool();
+        if (jump_out_of_ibd && chainman.IsInitialBlockDownload()) chainman.JumpOutOfIbd();
+
         clock += std::chrono::seconds{
                     fuzzed_data_provider.ConsumeIntegralInRange<int64_t>(
                         -std::chrono::seconds{10min}.count(), // Allow mocktime to go backwards slightly
diff --git a/src/test/fuzz/process_message.cpp b/src/test/fuzz/process_message.cpp
index b4a08cfdd29..932a4c2fa15 100644
--- a/src/test/fuzz/process_message.cpp
+++ b/src/test/fuzz/process_message.cpp
@@ -83,7 +83,7 @@ FUZZ_TARGET(process_message, .init = initialize_process_message)
     connman.Reset();
     auto& chainman{static_cast<TestChainstateManager&>(*node.chainman)};
     const auto block_index_size{WITH_LOCK(chainman.GetMutex(), return chainman.BlockIndex().size())};
-    GetFakeNodeClock().set(1610000000s); // any time to successfully reset ibd
+    GetFakeNodeClock().set(1610000000s); // 2021-01-07, arbitrary
     FakeSteadyClock steady_clock;
     chainman.ResetIbd();
     chainman.DisableNextWrite();
@@ -126,6 +126,10 @@ FUZZ_TARGET(process_message, .init = initialize_process_message)
     connman.FlushSendBuffer(p2p_node);
     (void)connman.ReceiveMsgFrom(p2p_node, std::move(net_msg));
 
+    if (fuzzed_data_provider.ConsumeBool()) {
+        chainman.JumpOutOfIbd();
+    }
+
     bool more_work{true};
     while (more_work) {
         p2p_node.fPauseSend = false;
diff --git a/src/test/fuzz/process_messages.cpp b/src/test/fuzz/process_messages.cpp
index cec2bc3fb5d..094c956f777 100644
--- a/src/test/fuzz/process_messages.cpp
+++ b/src/test/fuzz/process_messages.cpp
@@ -72,7 +72,7 @@ FUZZ_TARGET(process_messages, .init = initialize_process_messages)
     connman.Reset();
     auto& chainman{static_cast<TestChainstateManager&>(*node.chainman)};
     const auto block_index_size{WITH_LOCK(chainman.GetMutex(), return chainman.BlockIndex().size())};
-    GetFakeNodeClock().set(1610000000s); // any time to successfully reset ibd
+    GetFakeNodeClock().set(1610000000s); // 2021-01-07, arbitrary
     FakeSteadyClock steady_clock;
     chainman.ResetIbd();
     chainman.DisableNextWrite();
@@ -107,7 +107,13 @@ FUZZ_TARGET(process_messages, .init = initialize_process_messages)
         connman.AddTestNode(p2p_node);
     }
 
+    // Toggle IBD from within the loop, so that some messages may be processed
+    // under IBD and the rest after leaving it. JumpOutOfIbd() latches, so guard
+    // it to call at most once.
+    bool jump_out_of_ibd{false};
     LIMITED_WHILE (fuzzed_data_provider.ConsumeBool(), 30) {
+        if (!jump_out_of_ibd) jump_out_of_ibd = fuzzed_data_provider.ConsumeBool();
+        if (jump_out_of_ibd && chainman.IsInitialBlockDownload()) chainman.JumpOutOfIbd();
         const std::string random_message_type{fuzzed_data_provider.ConsumeBytesAsString(CMessageHeader::MESSAGE_TYPE_SIZE).c_str()};
 
         GetFakeNodeClock().set(ConsumeTime(fuzzed_data_provider));