diff --git a/lib/mempool/fees.js b/lib/mempool/fees.js
index 29c3230c..18f7db1a 100644
--- a/lib/mempool/fees.js
+++ b/lib/mempool/fees.js
@@ -43,22 +43,47 @@ var FREE_THRESHOLD = constants.tx.FREE_THRESHOLD;
  * Confirmation stats.
  * @exports ConfirmStats
  * @constructor
- * @param {Number} buckets
- * @param {Number} maxConfirms
- * @param {Number} decay
  * @param {String} type
+ * @param {Logger} logger
  */
 
-function ConfirmStats(buckets, maxConfirms, decay, type, logger) {
-  var i;
-
+function ConfirmStats(type, logger) {
   if (!(this instanceof ConfirmStats))
-    return new ConfirmStats(buckets, maxConfirms, decay, type, logger);
+    return new ConfirmStats(type, logger);
 
   this.logger = logger || Logger.global;
+
+  this.type = type;
+  this.decay = 0;
+  this.maxConfirms = 0;
+
+  this.buckets = new Float64Array(0);
+  this.bucketMap = new DoubleMap();
+
+  this.confAvg = [];
+  this.curBlockConf = [];
+  this.unconfTX = [];
+
+  this.oldUnconfTX = new Int32Array(0);
+  this.curBlockTX = new Int32Array(0);
+  this.txAvg = new Float64Array(0);
+  this.curBlockVal = new Float64Array(0);
+  this.avg = new Float64Array(0);
+}
+
+/**
+ * Initialize stats.
+ * @param {Array} buckets
+ * @param {Number} maxConfirms
+ * @param {Number} decay
+ * @private
+ */
+
+ConfirmStats.prototype.init = function init(buckets, maxConfirms, decay) {
+  var i;
+
   this.maxConfirms = maxConfirms;
   this.decay = decay;
-  this.type = type;
 
   this.buckets = new Float64Array(buckets.length);
   this.bucketMap = new DoubleMap();
@@ -83,7 +108,7 @@ function ConfirmStats(buckets, maxConfirms, decay, type, logger) {
   this.txAvg = new Float64Array(buckets.length);
   this.curBlockVal = new Float64Array(buckets.length);
   this.avg = new Float64Array(buckets.length);
-}
+};
 
 /**
  * Clear data for the current block.
@@ -374,7 +399,9 @@ ConfirmStats.fromRaw = function fromRaw(data, type, logger) {
       throw new Error('Mismatch in fee/pri conf average bucket count.');
   }
 
-  stats = new ConfirmStats(buckets, maxConfirms, decay, type, logger);
+  stats = new ConfirmStats(type, logger);
+
+  stats.init(buckets, maxConfirms, decay);
 
   stats.avg = avg;
   stats.txAvg = txAvg;
@@ -392,14 +419,9 @@ ConfirmStats.fromRaw = function fromRaw(data, type, logger) {
  */
 
 function PolicyEstimator(minRelay, network, logger) {
-  var fee, priority, boundary;
-
   if (!(this instanceof PolicyEstimator))
     return new PolicyEstimator(minRelay, network, logger);
 
-  fee = [];
-  priority = [];
-
   this.network = Network.get(network);
   this.logger = logger || Logger.global;
 
@@ -411,6 +433,31 @@ function PolicyEstimator(minRelay, network, logger) {
     ? MIN_PRIORITY
     : FREE_THRESHOLD;
 
+  this.feeStats = new ConfirmStats('FeeRate', this.logger);
+  this.priStats = new ConfirmStats('Priority', this.logger);
+
+  this.feeUnlikely = 0;
+  this.feeLikely = INF_FEERATE;
+  this.priUnlikely = 0;
+  this.priLikely = INF_PRIORITY;
+
+  this.map = {};
+  this.mapSize = 0;
+  this.bestHeight = 0;
+
+  this.init();
+}
+
+/**
+ * Initialize the estimator.
+ * @private
+ */
+
+PolicyEstimator.prototype.init = function init() {
+  var fee = [];
+  var priority = [];
+  var boundary;
+
   for (boundary = this.minTrackedFee;
        boundary <= MAX_FEERATE;
        boundary *= FEE_SPACING) {
@@ -427,24 +474,26 @@ function PolicyEstimator(minRelay, network, logger) {
 
   priority.push(INF_PRIORITY);
 
-  this.feeStats = new ConfirmStats(
-    fee, MAX_BLOCK_CONFIRMS,
-    DEFAULT_DECAY, 'FeeRate',
-    this.logger);
+  this.feeStats.init(fee, MAX_BLOCK_CONFIRMS, DEFAULT_DECAY);
+  this.priStats.init(priority, MAX_BLOCK_CONFIRMS, DEFAULT_DECAY);
+};
 
-  this.priStats = new ConfirmStats(
-    priority, MAX_BLOCK_CONFIRMS,
-    DEFAULT_DECAY, 'Priority',
-    this.logger);
+/**
+ * Reset the estimator.
+ */
 
+PolicyEstimator.prototype.reset = function reset() {
   this.feeUnlikely = 0;
   this.feeLikely = INF_FEERATE;
   this.priUnlikely = 0;
   this.priLikely = INF_PRIORITY;
+
   this.map = {};
   this.mapSize = 0;
   this.bestHeight = 0;
-}
+
+  this.init();
+};
 
 /**
  * Stop tracking a tx. Remove from map.
diff --git a/lib/mempool/mempool.js b/lib/mempool/mempool.js
index a359d566..83f82a6d 100644
--- a/lib/mempool/mempool.js
+++ b/lib/mempool/mempool.js
@@ -240,6 +240,46 @@ Mempool.prototype._removeBlock = function removeBlock(block) {
   this.rejects.reset();
 };
 
+/**
+ * Reset the mempool.
+ * @returns {Promise}
+ */
+
+Mempool.prototype.reset = co(function* reset() {
+  var unlock = yield this.locker.lock();
+  try {
+    return this._reset();
+  } finally {
+    unlock();
+  }
+});
+
+/**
+ * Reset the mempool without a lock.
+ * @private
+ */
+
+Mempool.prototype._reset = function reset() {
+  this.size = 0;
+  this.totalOrphans = 0;
+  this.totalTX = 0;
+
+  this.waiting = {};
+  this.orphans = {};
+  this.tx = {};
+  this.spents = {};
+  this.coinIndex.reset();
+  this.txIndex.reset();
+
+  this.freeCount = 0;
+  this.lastTime = 0;
+
+  if (this.fees)
+    this.fees.reset();
+
+  this.rejects.reset();
+};
+
 /**
  * Ensure the size of the mempool stays below 300mb.
  * @param {Hash} entryHash - TX that initiated the trim.
@@ -1810,6 +1850,11 @@ function AddressIndex(mempool) {
   this.map = {};
 }
 
+AddressIndex.prototype.reset = function reset() {
+  this.index = {};
+  this.map = {};
+};
+
 AddressIndex.prototype.getTX = function getTX(address) {
   var items = this.index[address];
   var out = [];
diff --git a/lib/node/fullnode.js b/lib/node/fullnode.js
index 4af1ba92..f662c28f 100644
--- a/lib/node/fullnode.js
+++ b/lib/node/fullnode.js
@@ -218,6 +218,8 @@ FullNode.prototype._init = function _init() {
 
   this.chain.on('reset', function(tip) {
     self.emit('reset', tip);
+
+    self.mempool.reset().catch(onError);
   });
 
   this.miner.on('block', function(block) {